i nerd sniped myself tonight and i imagine the NSA operative who is assigned to me is very confused by the increasingly erratic and frustrated google searches for HOW DO I CALCULATE THE MOON WHERE IS THE MOON
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@halcy the real problem here is that academic astronomy best practice is to tie everything into spherical coordinates on the firmament so they can factor out the earth enough that you can pretend it is a fixed vantage point that doesn't spin, and if god forbid you do need to tie an observation to geographic coordinates for some reason i guess you just burn an undergrad on it and not sully yourself with the indignity
@aeva i guess that feels to me like it makes sense historically but maybe not…. anymore?
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today's extremely basic astronomy question that i'm finding surprisingly difficult to find an answer to: are geographic coordinates and equatorial coordinates the same coordinate system except one is for looking up and the other is for looking down, or is there some essential conversion step needed to correlate them?
@aeva geographic lat long is relative to the an ellipsoid. 0 degrees longitude is fixed to the surface of the earth.
Equatorial is a sphere and the longitude equivalent doesn’t rotate with the earth.
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@aeva geographic lat long is relative to the an ellipsoid. 0 degrees longitude is fixed to the surface of the earth.
Equatorial is a sphere and the longitude equivalent doesn’t rotate with the earth.
@jkaniarz where I currently am stuck is how do you convert between the three when it is not the vernal equinox
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@aeva i guess that feels to me like it makes sense historically but maybe not…. anymore?
@halcy well, historically astronomy was among other things at times significantly concerned with answering the question "where the hell am I", whereas modern astronomy seems to be more split between "what is that specific bright object" and "visible spectrum is cringe"
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ok so back to the moon thing, i found another resource and i think i understand the why behind the asinine coordinate systems a little better but it also glosses over the math so it's kinda useless at the same time. i'm tempted to just make shit up and move on, but it would bother me that the function was wrong if i did that
@aeva i have copies of the explanatory supplement to the astronomical almanac in case i ever get enough of an urge to write astronomical software – both the 1960s edition and the more recent third edition that takes into account modern atomic time and general relativity and 🤯
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@aeva i have copies of the explanatory supplement to the astronomical almanac in case i ever get enough of an urge to write astronomical software – both the 1960s edition and the more recent third edition that takes into account modern atomic time and general relativity and 🤯
@fanf I just put in an order for the 2025 Astronomical Almanac - what is this about an explanatory supplement?
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ok so back to the moon thing, i found another resource and i think i understand the why behind the asinine coordinate systems a little better but it also glosses over the math so it's kinda useless at the same time. i'm tempted to just make shit up and move on, but it would bother me that the function was wrong if i did that
after a good night's sleep and reflecting on what I've learned so far, I've decided to follow the classic computer science strat: when faced with a problem you don't know how to solve, simply do something else, and pretend that is what you meant to do all along.
not only are horizontal coordinates the choice reference frame for backyard astronomers, the "altitude h" angular measurement is probably closer to the solution I wanted than my earlier framing of the problem. narf
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@fanf I just put in an order for the 2025 Astronomical Almanac - what is this about an explanatory supplement?
@aeva https://aa.usno.navy.mil/publications/exp_supp roughly speaking it explains the mathematical models used to caclculate the almanac
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@jkaniarz where I currently am stuck is how do you convert between the three when it is not the vernal equinox
@aeva If you know the position at the previous equinox, I think it’s as simple as spinning the moon around the earth (in the plane of the moons orbit) for 2*PI*t/27.3 radians, then spinning the earth for 2*PI*t radians.
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@aeva https://aa.usno.navy.mil/publications/exp_supp roughly speaking it explains the mathematical models used to caclculate the almanac
@fanf that sounds useful. looks like it is out of print though?
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after a good night's sleep and reflecting on what I've learned so far, I've decided to follow the classic computer science strat: when faced with a problem you don't know how to solve, simply do something else, and pretend that is what you meant to do all along.
not only are horizontal coordinates the choice reference frame for backyard astronomers, the "altitude h" angular measurement is probably closer to the solution I wanted than my earlier framing of the problem. narf
the math's not quite right, but i managed to get the moon more or less working
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the math's not quite right, but i managed to get the moon more or less working
@aeva god, on the 3rd day:
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the math's not quite right, but i managed to get the moon more or less working
This is the best post to read entirely out of context that I have seen in years.
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the math's not quite right, but i managed to get the moon more or less working
astronomy math is out of this fucking world btw like want to know where the moon is? great buckle up you're in for a few hundred years of bizarre hacks and lots of exciting questions like "wait, why are they using the julian calendar?"
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This is the best post to read entirely out of context that I have seen in years.
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@aeva god, on the 3rd day:
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astronomy math is out of this fucking world btw like want to know where the moon is? great buckle up you're in for a few hundred years of bizarre hacks and lots of exciting questions like "wait, why are they using the julian calendar?"
in a way magpie math is kinda refreshing, like imagine not throwing everything away every few years because of industry fads
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This post is deleted!
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astronomy math is out of this fucking world btw like want to know where the moon is? great buckle up you're in for a few hundred years of bizarre hacks and lots of exciting questions like "wait, why are they using the julian calendar?"
@aeva I think part of it is we stopped trying to guess based on date and moved to measurements and short term extrapolation
Gli ultimi otto messaggi ricevuti dalla Federazione
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@robhardware excellent point Rob. I also feel that vanity metrics play a lot into it too... they are reluctant to leave behind a platform - and rebuild from scratch in a new place - if they had accumulated a lot of followers over the years.
IMHO it's all about optics and ego - even if X has armies of bots and engagement has plummeted for real users... when will they see the light?
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Ieri su Radio Popolare è andata in onda una chiacchierata con me.
Mi piace Radio Pop <3
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La logica dei cartoni
Il cerotto sul vestito
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@elena @404mediaco @Em0nM4stodon Absolutely agree. I imagine there are quite a few politicians who instinctively feel they should be off X being advised by their political parties comms teams that they are losing a huge advertising opportunity, especially during elections, if they leave, and that they would be at a disadvantage to their opponents. Until the stigma of using X outweighs the electoral cost, I'm just not sure how much change we'll see.
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@macfranc @lauramassera @eticadigitale beh, attenzione perché la Apple deve assolutamente garantire (quasi per contratto) ai suoi clienti la privacy e la protezione dei loro dati. Tanto da avvisare loro stessi diversi clienti che nemmeno si erano accorti di aver subito intrusioni e controlli attivi sui propri dispositivi offrendo persino assistenza legale. Difendono semplicemente il loro "feudo" dando protezione (finché conviene) ai loro protetti che continuano semplicemente a consumare gadget e giochini digitali. Della libertà e della privacy in sé non gliene importa nulla a nessuno, né a chi si lascia possedere né tantomeno alle grandi aziende come Apple.
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Lavoratore muore per il freddo nei cantieri delle olimpiadi a cortina. “lo specchio del lavoro tossico e nocivo dei grandi eventi”
@anarchia
È morto per il freddo all’età di 55 anni Pietro Zantonini, originario di Brindisi, durante un turno di vigilanza notturna nel cantiere delle olimpiadi Milano-Cortina.
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@lauramassera Hai assolutamente ragione, ma diciamo anche che nel 2025 è impossibile non riconoscere che la malvagità antisociale è il tratto distintivo di quelle Big Tech che spesso si presentavano eticamente candide.
L'unica eccezione è probabilmente quella di Apple che effettivamente ha deciso, sia anche solo per questioni di marketing e narrativa aziendale, di opporsi alle nuove tendenze del cattivismo trumpiano
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@mattwiebe.blog what a journey!
I’m really impressed by your plans... I don’t think I’d ever have enough courage to pull something like that off. I hope I’ll get the chance to try your pizza someday!
Would be a great reason to visit Mexico 🙂
...and thanks for all your work on the ActivityPub plugin, I really miss your contributions ❤️
