gattr

11 ms·

121.
by gattr 3y ago
It's just visually jarring. Do you consider your use of spaces after commas and periods and capitalizing the first word in a sentence "pedantry"? To me it's at the same level.
122.
by gattr 3y ago
@Omin, @mda, just a side note: I recommend using the (centuries old, I guess) established typography rule and putting a space between the number and the unit symbol. See [1] for additional info. [1] SI Unit rules and style conventions, ht
123.
by gattr 3y ago
You're right, here are some numbers: - photosphere temperature: 5870 K - sunspot umbra temperature: 3000-4500 K Per Stefan-Boltzmann law, this can make the photosphere up to (5870/3000)⁴ ≈ 15 times brighter.
124.
by gattr 3y ago
I still do a playthrough of FC1 every two years of so (on highest difficulty). I love the game mechanics (though not the Trigen-heavy levels).
125.
by gattr 3y ago
For photospheric observations/imaging like here (also called "white light") you only need the inexpensive Baader AstroSolar film fitted onto your existing instrument (telescope, binoculars, photographic lens). ...but beware t
126.
by gattr 3y ago
(For some more details, see also [1].) The bright boiling granules (comprising most of the image) show photosphere convection. There's also the inward movement of the tips of penumbral filaments (which surround the dark sunspot cores),
127.
by gattr 3y ago
Thanks! The horizontal FOV is around 5 arcminutes. The granules (the bright convection cells comprising most of the image around the sunspots) are about 1000 km across on average.
128.
Time lapse of this week's large sunspot(astrobin.com)
51 points by gattr 3y ago|23 comments
129.
by gattr 3y ago
Captured with a 180 mm diameter telescope. The animation spans 20 minutes, with 20-second intervals between frames. edit: Also available as a smaller-sized H264 MP4 [1]. [1] https://www.cloudynights.com/gallery/image&#x
130.
by gattr 3y ago
Something also happens to regular polytopes. In 2D there are infinitely many regular polygons, in 3D there are 5 regular polyhedra, in 4D: 6, but for >=5D there are only 3. [1] https://en.wikipedia.org/wiki/Regular_p
131.
by gattr 3y ago
On my 24" 4K monitor TFA's font was indeed verging on unreadable. HN looks fine for me, though.
132.
Show HN: Video capture tool for astrophotography (in Rust with GTK)(github.com)
4 points by gattr 3y ago|0 comments
133.
by gattr 3y ago
I'm an amateur astronomer and astrophotographer and it seems to me the market for this is very limited. Most beginners start with simple 'scopes to dip their toes into the waters and see if they're into astro at all. Most adv
134.
by gattr 3y ago
Hog hunting is a subplot in Neal Stephenson's novel "Termination Shock" (set in the near future).
135.
by gattr 3y ago
Average Earth diameter = 2·6371 km ([1]). Size of glucose molecule ≈ 9 Å ([2]). Ratio = 7.06·10¹⁷. [1] https://en.wikipedia.org/wiki/Earth_radius [2] https://sphweb.bumc.bu.edu/otlt/mph-modules&#x2
136.
by gattr 4y ago
Quite unlikely, but see e.g. [1]: > Therefore, it is still possible that planets exist around main sequence stars in globular clusters, although at small numbers because of the low metallicity, and at orbital periods of >~10 days. [1]
137.
by gattr 4y ago
> Inside a 'thick' nebula, obscuring all other entities in the sky except for their own star and planets. Similarly to the alien planet in Eric Flint's "Mother of Demons"; there was a permanent thick cloud cover,
138.
by gattr 4y ago
As of recently, my setup for backups consists of 2x4 TB HDDs (from different manufacturers) with BTRFS in RAID 1, plugged into a small 2-drive USB3 docking station. With both checksumming and mirroring, feels pretty safe from HW-failure&#x2
139.
by gattr 4y ago
Yes, you can see just fine (with a bit less contrast than in those images). Of course, flares and prominences will not move in front of your eyes, but they do change over a few minutes.
140.
by gattr 4y ago
Shameless plug: I make time-lapse animations of solar flares (among other things) for fun, like this M-class [1] (46 min. of real time, 90 mm diameter telescope with narrow band Hydrogen-alpha filter). [1] https://www.astrobin.co
141.
by gattr 4y ago
Here's another take on "creating a person solely to do some work": I believe it can be done in a humane way. Say, generate (or use a mind scan of) a programmer who loves their craft (as in, used to dream "if I only didn&
142.
by gattr 4y ago
I've read recently that dentists no longer need to get a physical imprint / make a form in order to produce a (anti-clenching etc.) mouth guard - they can just do some sort of 3D scan of the teeth (can't remember if it was v
143.
by gattr 4y ago
Indeed. Hmm, but what if I roll a D20 before each flight and take a bomb only if I get a "1"? Do I decrease the average two-bombs probability to 5·10⁻⁶?
144.
by gattr 4y ago
I remember this one from a youth mathematics book. 10⁻⁴ chance of one bomb, and 10⁻⁸ of two (assuming the other one is an independent event — which it would be, as you're certainly not in collusion with any actual bomber).
145.
by gattr 4y ago
On a similar note: bullshit detection script [1]. For some fun, try using it on some large well-known tech corp's homepage. [1] https://mourner.github.io/bullshit.js/
146.
by gattr 4y ago
I see it differently; I'd be OK with an upload if the alternative is death, but only under strong protections: the digital version is legally treated as a human, I have full autonomy, the compute resources to run me (and the simulated
147.
by gattr 4y ago
Forgive my going off-topic, but what you wrote is basically my conclusion after reading the short story Lena [1] (mentioned some time ago on HN; strongly recommended). TL;DR: when mind uploading becomes possible, don't be an early adop
148.
by gattr 4y ago
I strongly recommend Timothy Snyder's lecture [1] on this topic (and the whole series in general). [1] The Making of Modern Ukraine. Class 15. Ukrainization, Famine, Terror: 1920s-1930s https://www.youtube.com/watch?v=
149.
by gattr 4y ago
Seconded. Add to that the (insane?) early SIOP, a plan for an all-out attack on the USSR with waves of nuke-armed strategic bombers. As for the Damascus accident, I'd love to watch a high-budget movie about it (preferably on the level
150.
by gattr 4y ago
I was quite uncomfortable (but managed to get the business done) for the first week or so after arriving in the US (business trip) due to the inch-wide gaps around stall doors. When flying back, going to the toilet in the first European air

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