Symbolic Forest

A homage to loading screens.

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Photo post of the week

More bits of countryside

The ongoing February, which feels as if it is the longest month of the past 12, is sapping my writing energy. Hopefully the oncoming spring will sort that out: today I saw my first queen bumblebee of the year flying purposefully around the neighbourhood looking for a spot to start her nest. This post is something of an appendix to the previous, with a few more photos. I’ve been repeating previous walks, but this time with the good camera.




I’ve been repeating previous walks, but this time with the good camera, which is why regular readers might spot some similarities. At some point I will tell you much, much more about the history of this particular railway, but not today.


It was built in the 1820s, as a plateway; I suspect that low wall on the right was put there in the 1890s when it was widened from single to double track.



Hopefully as the weather warms and the seasons change, my writing energy will come back too.

Life on Mars

Well, maybe

Astronomy fans probably already all know about the Nasa rover Perseverance, which landed successfully on Mars yesterday evening. The Child Who Likes Animals Space was greatly disappointed that the landing wasn’t going to happen until well past bedtime. “You wouldn’t find it very interesting anyway,” I told him. “All you’ll see is a bunch of people in a control room cheering. You won’t get the good pictures until later.” Indeed, although there was one slightly low-contrast black and white photo through within a few minutes to prove the lander had touched down the right way up, at the time of writing the good exciting stuff is due to be revealed shortly.

As the sun went down, though, the sky outside was crystal-clear and Mars was clearly visible a few degrees above the Moon. “Shall we get the telescope out and look at Mars ourselves instead?” I suggested, and of course The Children jumped at the idea.

I’m getting a bit bored of starting posts on here with “Since we moved house…”, but this is the natural point where I have to say “Since we moved house…”. Specifically, since we moved house, The Child Who Likes Space’s telescope has sat in its box in a cupboard; after all, it is February in Wales and we have hardly had a clear night since we moved in. So last night was the first time in this house that I took the telescope out of its box, set it up in the garden on the camping table, and looked to see what we could see.

To be honest, I wasn’t very hopeful. The new garden has a bright-white LED streetlamp shining straight into it. Moreover, as soon as I went outside, on came an automatic outside light. Could I find an off-switch for it anywhere? No, I could not. I was rather d, given these problems, to see that the sky was a wonderful bright blanket of visible stars, much clearer than anything we could ever see in Bristol.

Mars was easy to find, but still is barely more than a dot with the magnification we have available. After looking at Mars, we saw Orion was bright to the south, so zoomed in on Betelgeuse and then the Orion Nebula, or Messier 42 to its friends. In Bristol, the Orion Nebula only ever appeared in the eyepiece as a pale fuzziness which barely stood out from the background sky. Here, it was startlingly clear by comparison, a cold blue cloud against the background sky. Compared to our previous attempts to observe it, it was an entirely different experience.

By now clouds were starting to roll in from the north, so we packed everything up and went inside. As one last thing to try, I pointed the telescope at the moon and tried holding my phone to the eyepiece. Previously when trying this, I produced possibly the worst astrophotography ever. Last night’s attempt, therefore, can take the second-worst spot.

The moon

Maybe at some point I’ll actually get a proper adapter to strap my phone into and produce something slightly better.

At some point, when we can travel more widely, we’ll have to try putting the telescope in the car and heading up to one of the dark sky sites in the Brecon Beacons, to see just what we can see when we are out of town altogether with no streetlamps and no lights in neighbouring windows. For now, we’ll just have to wait for the next clear night, and see exactly how dark it is when we’re just in our own garden. Fingers crossed.

Photo post of the week

Ger y camlas

One aspect of moving house, especially if you move to a completely different neighbourhood or another town altogether, is the joy you can have in exploring the new area, finding all the interesting corners and places to go. In the current hospitals-overflowing stay-at-home situation, this is a bit limited; but at least there is exploration that can still be done on foot. In Bristol I was getting rather jaded of all the places I could visit on foot, even when it led to interesting local history blog posts. Now, there’s a whole new set of avenues of local history to explore.

One of the spots I can reach on foot is a quiet, sleepy canal backwater. You can’t even use it as a canal any more; most of the road bridges have been demolished or flattened out (or are roads that didn’t even exist when the canal was in use), so you can’t get any sort of boat under them. It’s essentially a long pond, busy with ducks and moorhens, and with its towpath busy with walkers.

Along the canal

Along the canalbank there are a few surviving hints of its industrial archaeology. Here, for example, is a mid-19th-century boundary post.

Canal boundary

This post must be from some decades after the canal was built, because “MR&CC” is the Monmouthshire Railway & Canal Company; and the canal company only added “Railway” into its name in the 1850s. The canal—the Crumlin arm of the Monmouthshire Canal—was built in the 1790s, but within 10 years of its opening some of its main users were looking to replace it with a railway. Not wanting to lose revenue, the canal company agreed to split the railway* midway: the lower half was built by the canal company and the upper by the owners of the Tredegar ironworks, with the dividing line at the nine-mile mark eventually becoming the village of Nine Mile Point. At opening in around 1805, the combined system was the longest railway network in the world, and quite a few stretches of the route are still in use now.

Later on, the split at Nine Mile Point was preserved. The upper section, the Sirhowy Railway, was bought by the London & North Western Railway. The canal company, though, was bought by the Great Western Railway, and some of their signage survives along the canal bank too.

GWR sign

This is a standard design of weight restriction sign—there are other GWR examples along other GWR-owned canals, and the North Yorkshire Moors Railway has a North Eastern Railway one.

No doubt I will have a lot more to say about local history in the future. As yet I’m not even sure what questions I want to ask, let alone have started to investigate the answers. At least when I do, though, I’ll be able to enjoy the scenery as I go. Even when I can only explore places I can reach on foot, there is still an awful lot to sit down and look at.


Mynydd Machen

* A quick terminology note: I’ve used the word “railway” in something of a blanket way here. The railways I’m talking about were built as what are now called “plateways”, with flanged track and unflanged wheels. At the time, in South Wales, they were generally (but not always) called “tramways” or “tramroads”.

See you later, alligator (part two)

In which something, for once, is completed

The bad thing about Lego is that if you’re just going to build the kit out of the box, it costs quite a lot of money compared to the time it takes to build the thing. The good thing about Lego, though, is that you can actually complete a project in a reasonable amount of time. Regular readers of this blog will be aware just how many half-finished craft projects I post about on here, and just how few completely finished ones there are (um, none). The Lego I posted about last week, by comparison, is already done! After three sessions, the kit is complete. I’m still not entirely sure why it merited an “18+” age guidance on the box, but it certainly did include lots of fiddly bits.

Pantograph parts

The ends of the pantograph collectors, incidentally are the same Lego element used for the claws of various dinosaur and other animal kits, but in silver.

Whenever I do Lego, I like to take lots of step-by-step photos, so it’s always very tempting to start posing the minifigs in positions to suit. I’m not sure they knew how to fit a connecting rod, although Lego rods do make wheel quartering extremely straightforward.

Putting the rods on

By now the Lego aficionados will have realised that this is the “Swiss Crocodile Locomotive” set slowly coming together. I don’t have any Lego track easily accessible right now, so I didn’t see any point getting the motor to go along with it; but I would imagine it is always going to be more of a display piece than a usable locomotive. Two flangeless pairs of wheels always seem to ride slightly off the rails, making its wheel arrangement a 1-1-B-1-1 or thereabouts. Still, I think it’s going to be quite a nice display piece for the office, when I have all the furniture in the office sorted out.

At some point I'll do a proper photo without random junk in the background

Even if I don’t have anywhere to put it properly yet, and even if it is only for display, the minifigs wanted to climb aboard as soon as it was complete.

Climbing aboard

In the cab

The hardest thing about building this model? Probably the design of the instruction book. A kit with a lot of brown or dark brown parts, with instructions printed on a black background, is not the easiest read. Still, I didn’t really go too far astray at any point in the build.

Will this lead to more craft projects suddenly being finished? Will there suddenly be a flood of completed work? Well, stranger things have happened. I certainly shouldn’t start any more until there are fewer in progress, certainly.

See you later, alligator

Or, a treat for myself

It’s strange, having a birthday that falls not long after Christmas. For a while now I’ve been past the age of receiving very many birthday presents, so a while ago I deliberately went out and bought myself a present, and put it away, waiting for my birthday. This year, too, my birthday was relatively close to moving house, the strange period in which everything frivolous, everything not house-move-related, has to go into stasis until the move is over. My present to myself was a Lego kit, and last night I was finally able to start to build it.

Last time I built some Lego I turned it into a GIF. This time, I was tempted to go the whole hog, set up camera and tripod and lighting, program the camera into time lapse mode, and create a video of the whole thing. It seemed like an awful lot of effort, though, for something that was supposed to be a treat for myself. Maybe after I’ve finished the model once, I’ll take it all apart, set up a time lapse, and build it again. Still, I did take a few photos. This is the end of Step 1.

Not much to show yet

It’s a bit hard to tell what it’s going to be after just one step, I suppose. I didn’t get the whole thing finished in one night, but I suspect this is going to be completed much faster than most of my craft-type projects.

Look, cogs

A bit clearer what it is

I do rather like the level of interior detail in this thing, even though a lot of it is likely to be hardly visible in the finished model. At present, it will just turn into something to sit on a shelf as an ornament in my office, but you never know, I might buy a motor to go with it at some point.

It's got controls and everything

The second part of this Lego build is here

Cofiwch Abermiwl

Like a train, this post is slightly late

A couple of days ago, it was the hundredth anniversary of a significant event in British railway history. If you’re a train nerd, you’ll know what it was from the title of this post. If you’re not, let’s start with this photo of the Severn Valley in rural mid-Wales.

The Severn Valley just west of Abermiwl

I took that photo a few years ago from the ruined battlements of the 13th century Dolforwyn Castle, and looking at it you could be forgiven for not even noticing the train in the middle of the picture. It’s on its way from Birmingham to the Welsh coast, on the former main line of the Cambrian Railways. Before 1922 the Cambrian was the largest “Welsh railway company”* in terms of route mileage, but not in terms of profit or revenue. Its main line was (and is) more like a long, rambling branchline; single-track, through small towns and tiny villages, from the Marches through to Aberystwyth and the curving coast of Cardigan Bay. That includes the line along the Severn Valley through Welshpool and Newtown, passing under the battlements of Dolforwyn Castle near the village of Abermiwl (or Abermule in its English spelling).

if you look closely you can see the train, its single track threading through fields and past farmhouses. See the white house on the left with the three chimneys? See the railway line passing behind it? A hundred years ago this week, two trains, going in opposite directions, collided head-on at that precise spot. Seventeen people were killed, including Lord Vane-Tempest, director of the Cambrian Railways and High Sheriff of Montgomeryshire.

The significant thing about the Abermiwl crash is that, in theory, it should not have happened. In theory, the single lines of the Cambrian Railways were protected by a “token system”. Without going into too much detail: the rules of a token system state that all trains travelling from “token station” to token station must be carrying a token, an arbitrary “thing” with the names of the token stations engraved upon it. The physical form of the token varies: a baton, for example, or a large key. The Cambrian Railways used “tablets”, metal discs a few inches across. Each section of line has a set of tokens, but they normally sit locked in machines called “token instruments” at each token station. The instruments are electrically wired together in a similar way to a pair of light switches at either end of a staircase, so that if you unlock one token from one instrument, you then can’t take any more tokens out of either, until a token has been locked back into one of the instruments. Ergo, assuming the drivers follow the rule on not setting off without a token—and it is one of the gravest rules in the Rule Book—nothing can go wrong.

On 26th January 1921 a westbound slow train arrived at Abermiwl and handed over its token, for the Montgomery—Abermule section of line. It was booked to wait to pass the Aberystwyth—Manchester express heading in the other direction, but the station staff were collectively unsure whether that would be happening on this particular day, or where the express currently was. In reality, the express was steaming hard in the middle of the Abermule—Newtown section of line, but none of the station staff actually knew that, and only one knew that a token had been issued for it at Newtown. Through something best described as a gruesome stage farce, or a nightmarish pantomime, the Montgomery—Abermule token was passed hand-to-hand among the station staff and back to the loco crew, who assumed it was the Abermule—Newtown token they were expecting, and didn’t look at it to check. Without anyone who knew the location of the express noticing, the slow train set off carrying the wrong token. A mile outside the station, the two trains collided. The station staff, by that point, had already realised what they had done and that the trains were doomed, but were unable to stop them.

The accident investigation report made it very clear just how the event had happened, and “Remember Abermiwl” became a watchword across railways worldwide. In India, it was written in Urdu inside the cabs of locomotives. It became standard practice for train crew to shout out the names of the stations on each token to each other, and pass the token around the cab for everyone to read aloud, so the identity of each was double- and triple-checked at each token station. If you go and visit a steam railway, you can still see and hear that happen, if you’re in the right place at the right time. The peaceful green fields in the photo above had an impact on railway working around the world; and the lesson is worth remembering in other fields too. Avoid passing jobs hand to hand; always make sure everything is clear and agreed. Cofiwch Abermiwl.

If you want to know the full details of exactly how the accident happened, who said what to who, and precisely how the Montgomery token ended up in the wrong place, it is all spelled out in the accident report written by the Board of Trade’s Chief Inspecting Officer of Railways, John Pringle. There is a postscript to this, though. Despite the importance of Abermule in railway history, a similar event almost happened in August 2019 on the miniature Romney, Hythe and Dymchurch Railway in Kent. There, the trains saw each other with enough warning to stop before colliding. However, the causes of that event were similar enough that the official government report on the incident includes Abermiwl under the heading “Previous Similar Occurrences”. Remember Abermiwl, indeed. The safest of systems can be defeated if the proper processes are ignored and slowly slip away over time. Cofiwch Abermiwl.

Temporary Update: back in the 1990s S4C produced a short documentary about the Abermiwl crash. For the anniversary it was repeated, so for the next few weeks people in the UK can watch it on BBC iPlayer. It’s in Welsh, but with English subtitles too.

* Technically speaking, the head office and engineering base of the company was not in Wales, but slightly over the border in Oswestry. However, if you were to consider all of the railway companies which had the majority of their track mileage in Wales (including Monmouthshire, let’s not get silly now) as Welsh railway companies, the Cambrian was the longest.

New star in the sky

Or, some astronomy news

When you’re learning about astronomy, you quickly get used to the idea that on a human timescale everything is static and nothing really changes. The Earth is going to be swallowed up by the sun,* but it won’t be for a few billion years yet. When you look up at the sky the light you see from other stars has been travelling for hundreds, thousands or millions of years. In general this is all part of the Copernican principle: on a universal scale there’s nothing special about where we are or when we are, other than that we could only be living at a time and place where planets are commonplace. Therefore, there’s not a very high chance of anything special happening whilst we’re looking.

However, that doesn’t mean that interesting things can’t happen. Before the end of the century, there will briefly be a new brightest star in the sky.

The star in question is V Sagittae (or V Sge to its friends). Sagitta—not to be confused with Sagittarius— is a small constellation adjoining Cygnus. Unless you’re an astronomy fan it’s the sort of constellation you might not even have noticed, as it’s small and it doesn’t have any very bright stars in it. Living where we do, I’d struggle most nights to see even its brightest star with the naked eye. V Sge is in theory just about visible in The Child Who Likes Animals’ telescope; it’s around magnitude 10, although it varies quite a bit and over quite short timescales.

Since it was first discovered it’s been realised that it was a bit unusual. It’s a binary system, with an “ordinary” sun-like star orbiting around a smaller white dwarf. More recently, astronomers realised that the pair of stars were getting noticeably brighter over time as their orbit shrinks and they get closer to each other. Last week, it was announced that at some time in the last three decades of the current century, they will finally spiral into each other and temporarily become the brightest star in the sky. If you want to know full details, this is the press release of the announcement from Louisiana State University, and here are links to the full data.

At present the time range is a bit on the vague side, but it will almost certainly happen in a 32-year span centred on 2083. No doubt, now that more astronomers know about this, we’ll get more data over the next few years to narrow down the time range. And even before then, V Sge will probably get a bit brighter over time, as it’s doubled in brightness in the past 90 years. I might even see if we can see it ourselves now if we get good conditions: its part of the sky is well-positioned for early evening viewing from here at this time of year. I’m not likely to see it go nova myself, but The Children might do.

* Assuming nothing else catastrophic happens to it first, such as being kicked out of the Solar System completely. It’s unlikely but it’s not impossible.

Just like clockwork (part one)

Time for a building project

Back in the mists of time on Boxing Day, I posted a clue as to what one of my Christmas presents was. A model tram from UGears, which I have been slowly assembling since.

It’s been a fun project, but I’m not completely sure it lives up to the promise on their website that “no glue, special expertise, tools or equipment are required”. With a fair wind and if everything goes well, then maybe. When I opened the box, the kit consisted of:

  • Various laser-cut plywood sheets.
  • Two rubber bands.
  • A small square of fine sandpaper.
  • A number of cocktail sticks, individually wrapped.
  • A glossy and comprehensive instruction book.

The instruction book is very good and very clear, with each step being shown as a 3D-rendered diagram. However, it starts off listing the extra pieces of equipment you need which aren’t supplied:

  • Candle wax, to lubricate the moving parts.
  • A knife, to cut some of the cocktail sticks to length.

With those to hand, you start off by assembling various gear shafts. Each of these assemblies consists of the gears themselves, four wooden wedges that are inserted through the gear centres, and a cocktail stick that has to be squeezed through a small hole left right in the middle where the four wedges meet.

The first gear shafts

These are the first ones in the instructions; gears, but also the main “wheels” that the tram sits on. The instructions say the cocktail stick should be inserted symmetrically, with the same length protruding from each end, so it’s very helpful to have a small steel rule to assist with doing it by eye. If the “axle” isn’t symmetrical, a measuring tool is included in the kit to indicate how much the stick should project from one end.

Inserting the cocktail sticks was the first big hurdle. Making the kit in the advised way—assemble the wedges into the gears then slide the cocktail stick down the middle—is very hard to do without accidentally blunting the sharp points at the ends. Unless you’re dealing with one of the gear shafts which needs one or both ends trimming short, this is a problem, because it’s very easy to blunt the sticks to the extent they won’t work any more. I found for most it was easier to assemble the shafts in a slightly different order: take one gear, insert the wedge pieces and the cocktail stick into that gear alone, then squeeze the wedges together at the other end and slide the other gear over the wedges’ clip-shaped ends.

The tolerances of the cocktail sticks don’t help, either. Some parts require sticks to be inserted into holes in the plywood parts, and these are all supposedly a push fit. What quickly became clear is that the cocktail sticks are made to rather looser tolerances than the laser-cut parts: some sticks will be a reasonable push-fit in the holes, and some will have no chance of going in. With these parts, I ended up picking which stick I was going to use, then opening out the hole with a broach to fit. If I went a bit too far and made it a sliding fit, I used a little dab of Resin W to glue the stick in place.

The parts for a pawl

You can see this under way with these parts for the pawl which holds the “rubber band shaft” tight after it’s been wound. You can also see that here I’m reusing a cocktail stick whose end I have already wrecked, in a position where it will be trimmed off short. As the lowest of the three holes in each pawl piece is rather close to the edge, I found one of the narrower sticks in the kit for that position, so it wouldn’t need opening out at all. You can clearly see the different widths of the supplied cocktail sticks, and on the right-hand pawl piece you can see how much I’ve had to open out the uppermost hole, compared to the unmodified bottom hole, in order for the fat stick at the top to be a push fit into it. Using a broach for this, it’s easy to roughly remember how much of the broach’s cutting length is needed to get the hole to around the right width before you start testing for fit.

Assembled pawl awaiting trimming

Once the parts were pushed onto the sticks, the ends of two could be trimmed off, leaving a single shaft for it to pivot on.

Completed pawl

Building all the various gears and related parts took quite a few hours, so it was rather pleasing how easily the main framework of the tram fitted together, and how straightforward it was to slip the ends of each shaft into their appropriate hole in the frames. It was rather pleasing, too, to find how well the initial gear chain rotated. It links the wheels together, and also includes a shaft which seems to be in there purely to make a clicking noise.

You might notice that the pawl from the previous photos hasn’t been fitted to the main assembly yet. That comes later, and was a little bit more fiddly. We’ll come on to that another time.

To be continued.

Under clear skies

Or, some unexpected astronomy

“Is it cloudy or clear?” said The Child Who Likes Animals yesterday evening after finishing his tea.

“I don’t know,” I said, knowing the weather forecast was showing a solid grey sky for the whole of the evening. “Let’s have a look,” knowing there was little risk of us being able to look at the stars.

I opened the back door, and was rather surprised to see clear skies and good visibility. “LET’S GET THE TELESCOPE OUT!” screamed The Child Who Likes Animals Space. I had been planning to head straight to the sofa and the book I’m in the middle of reading,* but agreed that, if we could come up with a sensible plan for what we were actually going to look at, I would set it all up for him.

We fired up Stellarium and I tried to find things that would be interesting to see and straightforward to find. Outside, I had already seen the cross of Cygnus was fairly high in the sky, with Cassiopeia above it, so I make a risky suggestion. “Why don’t we try to see the Elephant’s Trunk Nebula?” I said, knowing that with our inner-city skies nebulas and other deep-sky objects do not put on a very good show. It does, though, have a very child-friendly name.

I set the telescope up on the table outside, and tried to get my eye in. It was immediately obvious that viewing conditions were on average far, far better than they had been on New Years Eve. The Elephant’s Trunk Nebula has the benefit that it’s close to an easy-to-find star, Alderamin (α Cephei). I quickly navigated ten degrees south to the location of the nebula, was confident I was there from the pattern of the stars. And was there anything? Well … maybe. Charitably, I could convince myself that the sky did indeed look slightly brighter than elsewhere in the sky; that I could see hints of structure that were not just inside my own eyeballs and brain. The Children, though, would have none of it.

Luckily, I’d noticed there was something interesting just by the nebula, and confirmed with the computer that I was looking at Herschel’s Garnet (μ Cephei). It’s a red supergiant star, a thousand times broader than our sun, and a distinctive pale peach colour to the eye—the astronomer William Herschel described it as “deep garnet”, hence the name. As its colour is so clear to see, The Children were reasonably impressed.

As it was so clear, we also pointed the telescope at the Pleiades, the view of which wowed The Child Who Likes Fairies (“There’s literally trillions of stars!”) then, the cluster NGC 7686 and the Andromeda Galaxy. The latter was, to my eyes, a slightly clearer fuzzy blob than it has been in the past, but still just a fuzzy blob. The Child Who Likes Animals said he could see it clearly; The Child Who Likes Fairies could not.

Thinking about what we should be able to see in the sky, I did a bit of maths. Say the pupil of one eye when it’s dilated is about 8mm wide—I’m just guessing this part really. We’re using a 150mm telescope: that’s 350 times as large as a pupil, so it gathers 350 times as much light. That’s a difference in astronomical magnitude of just under 6.4. Now, when I was aiming the telescope last night, once my eyes were adapted I could just about make out stars of magnitude 3.8 to 4.2; such as the stars λ Andromedae, κ Andromedae and ι Andromedae, which I used to find NGC 7686 and which I’ll have to write about again some other time.** I suspect that that’s as good as things are ever going to get in our hazy and light-polluted urban sky. But taking the telescope’s light-gathering power into account, if I’ve got the theory correct, I should be able to see things of magnitude 10 to 10.5 or so through it. Next time we have good seeing, I should test this out: look up at a few things and find out what the official magnitude of the stars I can just barely see is.

When I’ve done that, of course, I should probably think about getting some way to record what I can see, rather than just trying to describe it to you. The Child Who Likes Animals’s telescope is a Dobsonian with an altitude-azimuth mount, which means long-exposure photos are probably out, but I’d like to look at our options and see exactly what we could try to do instead.

* The Northmen’s Fury: A History of the Viking World by Philip Parker.

** Because in looking up their names for this post, I’ve discovered they form part of the former constellation named after Friedrich the Great of Prussia, Honores Friderici.

More meteors

You wait for months, and then...

Another small astronomy note: the first of the year’s big meteor showers occurs over the next couple of days. I know it’s less than a month since the last big meteor shower of 2020, the Geminids, but tomorrow we have the peak of the Quadrantid shower. They’re a bit harder to see than the Geminids, partly because they’re usually fainter and partly because they’re concentrated into a narrower stream, so they’re seen over a much shorter time-range. Moreover, looking at the weather forecast, I doubt we’re going to have clear enough skies to have any chance of seeing them.

Interestingly, the Quadrantids are named after a constellation that doesn’t officially exist any more. Their name comes from Quadrans Muralis, “the wall-mounted quadrant”, a constellation named in the late 18th century by Jerome Lalande—he named it after an astronomical instrument he’d used to help him map the sky. Naming constellations after scientific machinery was quite fashionable in the 18th century; we still have Antlia, Horologium, Microscopium, Octans and Reticulum in the sky, to name just a few. Nevertheless, when the boundaries of the constellations were officially defined by the IAU back in the 1920s, Quadrans Muralis was left out of the list. Its part of the sky is now mostly split between Draco and Boötes, with a small piece in Hercules. You could argue the Quadrantids should really have been renamed the Boötids, but the old name has stuck.