maxnoe

15 時間前議論

> The square root of -1 doesn't correspond to any quantity you could count or measure directly (you can't have negative one apple, for instance)

That must be the worst explanation of complex numbers I ever read. It's not even remotely connected.

maxnoe

21 時間前議論

Unix time does not count elapsed seconds in real time since 1970-01-01T00:00:00, this is a common misconception.

Unix time assumes a fixed number of seconds per day. 86400. If a leap second is inserted, either end of June or end of December, the day is 86401 seconds long.

There are different implementations for how your Unix time will behave 24 hours before to 24 hours after the leap second. A timestamp might just repeat during the leap second or the system changes the length of a second in a time range around the leap second introduction to make up the difference. This is called smearing.

A simple example is the elapsed time between these two timestamps:

    2016-12-31 23:59:50
    2017-01-01 00:00:10

Unix time differs by 20 seconds (assuming the system/library doesn't use smearing). But actually elapsed time is 21 seconds, since

    2016-12-31 23:59:60

was the last added leap second. This timestamp cannot be represented by Unix time (again assuming no smearing, with smearing you could).

maxnoe

昨日議論

No, the current rules are being relaxed because with the current ones, a negative leap second _might_ happen in the near future.

It did not happen yet. No negative leap second that should have been inserted was skipped.

See this chart here:

https://en.wikipedia.org/wiki/DUT1#/media/File:Leapsecond.ut...

You can see the the positive leap seconds as jumps upward once the graph reaches around -0.5 s.

We were never close to reaching +0.5 seconds with a positive trend and we are still relatively far away from that.

maxnoe

先月議論

GitHub Incident again/

maxnoe

2 か月前議論

Imaging Atmospheric Cherenkov Telescopes, we detect optical light emitted by high energy particle Cascades in the atmosphere to observe cosmic gamma radiation.

The particles need the atmosphere to interact, Cherenkov light is only emitted in an optical medium and because it's optical light we measure we are affected by satellites. Not as strongly as optical telescopes though, because the air showers last for only tens of nanoseconds.

maxnoe

2 か月前議論

One would be support for ligatures

maxnoe

2 か月前議論

Our telescopes actually need the (or at least an) atmosphere to function.

There are some classes of observatories, which you cannot build in space but which are still affected by satellites to some degree.

maxnoe

3 か月前議論

> This is where I usually insert that 3,000 year old Gandalf meme.

Elrond?

maxnoe

3 か月前議論

Copying my comment from the other recent thread:

The authority on the definition of SI units is very clear:

> The hertz shall only be used for periodic phenomena and the becquerel shall only be used for stochastic processes in activity referred to a radionuclide

Usually, no radionuclides are involved in web requests.

https://www.bipm.org/documents/d/guest/si-brochure-9-en-pdf

maxnoe

3 か月前議論

Keep in mind that our current instruments are not really sensitive to most exoplanets that would be interesting for a sci-fi setting.

Current instruments are mostly good at finding large planets around small stars, we are basically blind to earth-like planets around sun-like stars.

See e.g. https://www.nobelprize.org/prizes/physics/2019/queloz/lectur...

maxnoe

3 か月前議論

Please don't.

The authority on the definition of SI units is very clear:

> The hertz shall only be used for periodic phenomena and the becquerel shall only be used for stochastic processes in activity referred to a radionuclide

Neither is usually the case for requests.

https://www.bipm.org/documents/d/guest/si-brochure-9-en-pdf

maxnoe

3 か月前議論

Yes, the year has pi * 1e7 seconds

1e5 / 3.14e7 ≈ 3e-3, milli, not micro

maxnoe

3 か月前議論

Or as Stephen Fry put it: "Nature, Nurture and Nietzsche", very fitting here.

maxnoe

3 か月前議論

There is a section in the GitHub Readme of Eurooffice with a justification of the fork:

https://github.com/Euro-Office#euro-office-liberates-the-onl...

maxnoe

4 か月前議論

"Most companies still do not publish Linux builds for creative software"

There, fixed it for you.

It's not like Linux is the blocker here.

maxnoe

4 か月前議論

Absolutely not. You could argue this for entry level lectures, but not at the PhD level. PhD is learning how to do original research, how could you separate teaching that from doing that?

maxnoe

4 か月前議論

Ever tried latexmk for the automation?

maxnoe

5 か月前議論

But this exact example is different, because the critical step of mutation is missing.

The initial line is the same, but:

    a = b = random.random()
    a += 1
    a == b # False

Only because floats are immutable and thus an implicit copy is made and lists are mutable so the same mutable instance is pointed to by both names.

This talk still applies despite its age: https://youtu.be/_AEJHKGk9ns?si=q5HjMOM9QS3_bFzH

maxnoe

6 か月前議論

Science never proves a positive.

You can only disprove.

The only way to prove a positive if there is a finite number of possibilities and you have disproven all but one. But even then, someone could conceivably come up with an alternate description that preserves the current understanding but makes additional predictions or is a simpler model making the same.

As Feyman said: "We can never know if we are right, we can only be certain if we are wrong".

maxnoe

6 か月前議論

If you are more into doing this locally than using a Webservice, have a look at astroplan based on astropy.

https://astroplan.readthedocs.io/en/stable/

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