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Post AyCD8BWKniVycB1BA0 by [email protected] |
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More posts by [email protected] |
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Post #Ay1IS4RXBctNUKW0Lg by [email protected] |
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i nerd sniped myself tonight and i imagine the NSA operative who is assigned to… |
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Post #Ay1IS4ZKid89sWAEVM by [email protected] |
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I just want to calculate the current direction of tidal force from the observer… |
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Post #Ay1IS4gQIGnmEVTtYW by [email protected] |
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wikipedia: even the ancient babylonians knew how to use math to figure out what… |
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Post #Ay1gpNB26ABf9ORP5U by [email protected] |
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@aeva you ping JPL for the measured coordinates and then newtonian physics to e… |
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Post #Ay1h9nafbSvgrWAkoS by [email protected] |
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@aeva Heh Iāve run into this in the past myself as well, wikipediaās remark… |
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Post #Ay1h9nip79S3GnzGWO by [email protected] |
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@froztbyte @aeva but accepts contributions! |
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Post #Ay1hBjV9mDoylAW2sa by [email protected] |
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@aeva omg @haskal knows how to do this |
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Post #Ay1hBjcbKXmB8FzzU0 by [email protected] |
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@wgahnagl @haskal how do i dot(normalize(moon - earth), normalize(me - earth)) |
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Post #Ay1hKgFPFDzfH2Pnsm by [email protected] |
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@aeva in case u just need the radial position, u can reference https://github.c… |
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Post #Ay1hp31L8gaUahJesq by [email protected] |
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@aeva @wgahnagl so i did a masto bot that awoos on the full moon once by using … |
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Post #Ay1iHMdHocjPWbZFBY by [email protected] |
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@aeva I usually just look up and if I donāt see the moon I subtract the sky I… |
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Post #Ay1iJKi7vr5s8wlpfU by [email protected] |
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@haskal @wgahnagl marvelous, ty ty |
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Post #Ay1iPAC3woXVGKYKwq by [email protected] |
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@marado @froztbyte i think they usually want people who know what they're t… |
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Post #Ay1vnWhfCvWLQfHVhI by [email protected] |
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@aeva but the babylonias left it as an exercise for the reader š |
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Post #AyBSCxF4cSozvviVLU by [email protected] |
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today's extremely basic astronomy question that i'm finding surprisingl… |
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Post #AyBSCxOI4CC6OW1riC by [email protected] |
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i feel like i'm so close to getting this working. i found a simple impleme… |
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Post #AyBSCxTbkQRof0W704 by [email protected] |
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i think astronomy would be a lot simpler if ancient peoples didn't get so h… |
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Post #AyBSCxZdO1GgxhKvOS by [email protected] |
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i just want to calculate my current ecliptic coordinates from my current geogra… |
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Post #AyBSCxfJ2vnzFHzSEa by [email protected] |
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i wonder to what extent astronomy is an insomnia friendly career still, or if i… |
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Post #AyBSCxkyhqLHWsdz4i by [email protected] |
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now that I'm a bit further down this rabbit hole I'm realizing this isn… |
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Post #AyBSCxr0LRA9pZSnT6 by [email protected] |
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one of the benchmarks we wanted to use had a typos where two digits were transp… |
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Post #AyBSCxxjwOYCAScAy0 by [email protected] |
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anyways, somewhere in peru there's a town that is legally somewhere between… |
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Post #AyBSCy3PbJ5US3Gho8 by [email protected] |
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time is fake, but as it happens space is also fake |
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Post #AyBSCy95GDcmjdvEeG by [email protected] |
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@aeva that's why when you multiply them together they're real. |
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Post #AyC2Z8K1ha8T19uNyi by [email protected] |
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it's a good thing countries are pretty short lived geologically speaking ot… |
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Post #AyC2Z8RTFu5fOFOKa8 by [email protected] |
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ok so back to the moon thing, i found another resource and i think i understand… |
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Post #AyC2Z8YCqrThj8Xi52 by [email protected] |
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@aeva i believe all our physical models diverge from reality on a long enough t… |
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Post #AyC2sFleFBKvbywg3E by [email protected] |
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@aeva a problem similar in complexity (likely even worse), weather prediction, … |
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Post #AyC3XNCjUyZaY8Dneq by [email protected] |
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@aeva is this one of those things where the approximate solution that drifts fr… |
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Post #AyC3XNKX1yoMwJs1oW by [email protected] |
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@halcy there's no closed form solution at all and from what i can tell the … |
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Post #AyC3XNT2WLcJMhqp4i by [email protected] |
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@halcy the real problem here is that academic astronomy best practice is to tie… |
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Post #AyC3XNaU4fZVjnKlg8 by [email protected] |
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@aeva @halcy i'd stick to euclidean coordinates. if you must center, use th… |
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Post #AyC3uv5nfYXAJQCsYC by [email protected] |
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@lritter @halcy the problem with euclidean coordinates is while they are mathem… |
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Post #AyC4BUWZhbB0prdGMq by [email protected] |
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@aeva @halcy *throws the pythagorean theorem in the trash* |
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Post #AyC4P0YJvwUvvwtUQq by [email protected] |
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@halcy i've got a feeling that this is what a self taught programmer feels … |
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Post #AyC4PAZOgnIj0BTUUy by [email protected] |
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@aeva are you modeling real life or an approximation of it? |
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Post #AyC4PAfQKO7bIsIItM by [email protected] |
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@efi yes |
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Post #AyC4PKPU6VJVWKuiR6 by [email protected] |
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@aeva *bites u* |
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Post #AyC4PMWeEqES58HSsa by [email protected] |
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@aeva I mean it's causing enough problems with gps they have dedicated stat… |
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Post #AyC4PMeRlqTETJvh2G by [email protected] |
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@aeva oh and the whole maps rescanning the whole city every now and then thing |
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Post #AyC4PMkpO7Zgn6umyu by [email protected] |
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@pupxel i think they continuously re-map cities because of construction not pla… |
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Post #AyC4PnxAGMUB9BtWSW by [email protected] |
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@aeva I mean, we already see similar issues with geographic borders. Especiall… |
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Post #AyC4Po4bogRNWHNT3w by [email protected] |
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@ataylor @aeva I am reminded of part of my city's border: the "nobody … |
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Post #AyC4PoBhOK6zsGh876 by [email protected] |
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@rey @ataylor did it get bricked over and repurposed as a sewer? |
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Post #AyC4QDcUppOykcQNqy by [email protected] |
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@aeva oh boy. I went down the rabbit hole of calculating star positions a few y… |
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Post #AyC4QDisS6VR4PPTnc by [email protected] |
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@jon_valdes my hope was that the moon's position relative to the earth woul… |
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Post #AyC4QDpy1kB3QOj8qm by [email protected] |
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@aeva what I found is most methods for calculating these things are approximati… |
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Post #AyC4QDwLe1HVkBiEnQ by [email protected] |
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@jon_valdes oh that's great. I figure for my use case it only has to be mo… |
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Post #AyC4QE2jGINy3yhKk4 by [email protected] |
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@aeva perhaps the easiest way would be to look at how other programs do it. I s… |
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Post #AyC4QEAAocLAR4BHLU by [email protected] |
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@jon_valdes i found this a few hours ago http://www.geoastro.de/elevazmoon/basi… |
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Post #AyC4QEGuPZjClxKeqO by [email protected] |
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@aeva @jon_valdes I'm trying to remember what program we use to generate lo… |
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Post #AyC4QEOLxtgP92obRo by [email protected] |
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@aeva @jon_valdes alright I think we just use data from sdss and reproject it f… |
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Post #AyC4QEVRXXM1V28GUy by [email protected] |
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@dotstdy @aeva oh, nice!Word of caution about calculating these things on the G… |
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Post #AyC4QEbp9oSTop7MRc by [email protected] |
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@jon_valdes @aeva right, yeah I should also mention all that is done on the cpu… |
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Post #AyC4QEhUoizm6PltHk by [email protected] |
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@dotstdy @aeva at least for star positioning f32 was barely enough for me... as… |
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Post #AyC4QEmoUxFUMuG8Zc by [email protected] |
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@jon_valdes @dotstdy blessedly I'm planning on doing this on the cpu, but D: |
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Post #AyC4QEsq8Y4Mfb4wy0 by [email protected] |
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@aeva @dotstdy if you want to see this in action, open this shadertoy on a few … |
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Post #AyC4QEzviBjz1aOc1A by [email protected] |
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@jon_valdes @dotstdy my laptop has a recent-ish Xe gpu |
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Post #AyC4QF6fJ981MTXzW4 by [email protected] |
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@jon_valdes @dotstdy it's bizarre seeing my 10 year old telephone's mal… |
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Post #AyC4QFCgwjwtfAMnuS by [email protected] |
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@jon_valdes @dotstdy though I guess the corner the intel case is cutting is whe… |
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Post #AyC4QFIiaKllxrBcIq by [email protected] |
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@jon_valdes @dotstdy would mollytime get a warmer, fuller sound if i switched t… |
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Post #AyC4QFOOFFJ4FRq98y by [email protected] |
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@aeva @jon_valdes generally cpu trig is not so bad, but does vary between platf… |
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Post #AyC4QFU3u9qMX2Ufz6 by [email protected] |
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@dotstdy @jon_valdes maybe I'll call the expensive exact soft sin oscillato… |
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Post #AyC4QFa5XkfEpjJUNU by [email protected] |
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@aeva @dotstdy @jon_valdes start a new genre "deca-dance" |
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Post #AyC4QFhX64cRConQyu by [email protected] |
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@demofox @dotstdy @jon_valdes well so far I can't tell the difference by ea… |
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Post #AyC4QFocfiI3Yo7624 by [email protected] |
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@demofox @dotstdy @jon_valdes assuming I didn't screw anything up adapting … |
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Post #AyC4QFwQCiWpwzlKBk by [email protected] |
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@aeva @demofox @dotstdy Yeah, I should have mentioned I'm not 100% sure of … |
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Post #AyC4QG39nfusHsuhge by [email protected] |
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@jon_valdes @demofox @dotstdy well I can tell from eyeballing it that it defini… |
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Post #AyC4TL6HTmu6osqOZc by [email protected] |
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@ataylor nothing a liberal application of hubris can't pretend to fix |
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Post #AyC4TTYa2SIJ2y96nI by [email protected] |
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@aeva "We shall put this river in a box and then everything's fine!&qu… |
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Post #AyC4TbM72h4hEcNGTI by [email protected] |
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@aeva at least all the measurement units are nailed down. https://www.nist.gov/… |
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Post #AyC4TbTYb11tbhrD4i by [email protected] |
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@kevingranade they did eventually redefine the kilogram as something other than… |
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Post #AyC4Tu5ROu1pKPiici by [email protected] |
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@aeva wouldnāt it matter more for smaller cities? |
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Post #AyC4TuBp1B8HeChoZM by [email protected] |
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@luana I figure the smaller the city the lower the odds you end up with grossto… |
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Post #AyC4U7NdyXJUYdKwIi by [email protected] |
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@aeva the not so short answer is sort of. Near exact conversion is tedious but … |
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Post #AyC4U7Tfc88MrK9kh6 by [email protected] |
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@siriusfox is this because real astronomers don't actually look at the sky … |
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Post #AyC4WLOopAFacEwpI8 by [email protected] |
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@aeva Isnāt there a day length difference needs accounting for? Sidereal vs s… |
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Post #AyC4WLUUU4mstpbM8G by [email protected] |
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@hypostase how would I know? |
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Post #AyC4WLas6LtLDcaS4u by [email protected] |
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@aeva The last time I looked at astronomical calculations was in the 80s. I don… |
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Post #AyC4WLgXlGQdVDEyv2 by [email protected] |
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@hypostase I'm just trying to calculate the vector from the center of the e… |
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Post #AyC4WiWkppGSLVpzM0 by [email protected] |
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@aeva oh what a fun onehave you encountered the thing where every computation i… |
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Post #AyC4WidqPSw4hV9ePA by [email protected] |
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@ireneista yes |
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Post #AyC4Wikvz6bh3UTJSK by [email protected] |
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@aeva "fun", isn't it |
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Post #AyC4Wiqbe18zL57qIS by [email protected] |
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@ireneista no |
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Post #AyC4X1ID47v4XuB8oy by [email protected] |
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@aeva that's how we feel, as wellwe have an entire computer algebra system … |
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Post #AyC4X1OEhijwqazxDM by [email protected] |
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@aeva because designing that is a lot more fun than just writing the code |
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Post #AyC4X8cfoRRpHOo5Bo by [email protected] |
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@aeva a lot of things would be simpler if cults based on "perfect" sh… |
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Post #AyC4X8k7MlP1eUI1nE by [email protected] |
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@SnoopJ we're still using spherical trig in astronomy today despite earth b… |
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Post #AyC4X8pn1fwJw4wYdM by [email protected] |
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@aeva well, yea, because astronomy doesn't really give a shit what shape th… |
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Post #AyC4X8wWcdKMGy5w8G by [email protected] |
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@SnoopJ @aeva everything is a sphere if you zoom out far enough |
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Post #AyC4X92CHXreYYkSyO by [email protected] |
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@glyph @SnoopJ i'm tired of all the spherical milky way conspiracy theorists |
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Post #AyC4X98Dv8gWrFZHMm by [email protected] |
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@aeva @glyph this is a really easy "whoa dude" win when doing physics… |
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Post #AyC4X9EFYjVP9wO5lA by [email protected] |
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@SnoopJ @glyph sure. it's just the hairy ball theorem taken to its logical… |
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Post #AyC4X9KdB0brTjNBho by [email protected] |
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@aeva on the other hand getting extremely horny for triangles is both funny and… |
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Post #AyC4X9k9e71gktJZUO by [email protected] |
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@aeva now you've got me wondering if LIGO/Virgo has to deal with all the wi… |
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Post #AyC4XK9KxL6z1tAp84 by [email protected] |
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@aeva @glyph I'll have to think about that for a bit but I love any excuse … |
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Post #AyC4XjAbvjz8d4xh5M by [email protected] |
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@SnoopJ mood |
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Post #AyC4Xtkma6rRS9xir2 by [email protected] |
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@aeva On cosmology sequence breaks: Terence Tao noted that an ancient Greek hel… |
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Post #AyC4Xtsa776DqLbx0i by [email protected] |
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@rf they were so close lol |
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Post #AyC4YAU2NcZFL9G5c8 by [email protected] |
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@aeva @demofox @dotstdy @jon_valdes There's lots of versions of CPU sin/cos… |
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Post #AyC4YAcBtJ5bkR4bK4 by [email protected] |
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@aeva @demofox @dotstdy @jon_valdes Also, if you care about precision at all, d… |
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Post #AyC4YAjdRd2o7WYXvU by [email protected] |
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@TomF @demofox @dotstdy @jon_valdes I already do the range reduction. I learne… |
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Post #AyC4ZDc6ECddKyWwhk by [email protected] |
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@aeva @lritter excuse me this is Mannheim erasure |
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Post #AyC4ZDiTqTk5elW2eO by [email protected] |
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@halcy @aeva this grid doesn't impress new yorkers or san franciscans in th… |
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Post #AyCBo4wBT1D0S4xR8y by [email protected] |
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@aeva @lritter @halcy |
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Post #AyCD8BWKniVycB1BA0 by [email protected] |
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@aeva @halcy It's a n>3 body problem alright. The Moon is large enough a… |
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Post #AyCqWCqBRNars5kOsi by [email protected] |
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@aeva āimagine a spherical cow, uh, planetā |
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Post #AyDtOAhI1J13vZPL8q by [email protected] |
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@hypostase @aeva yeah, that's a fun one. If you look at the Earth's rot… |
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Post #AyDtSD3xAPgsQFvyAy by [email protected] |
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@aeva @dotstdy Yup! I was using trig to calculate screen positions for the star… |
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Post #AyDtSM6lXKHuTaJqJE by [email protected] |
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@jon_valdes @dotstdy D: |
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Post #AyG5zURt8OjtfOgX0i by [email protected] |
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@aeva i have copies of the explanatory supplement to the astronomical almanac i… |
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Post #AyG5zUXYnJHBwzL3qq by [email protected] |
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@fanf I just put in an order for the 2025 Astronomical Almanac - what is this a… |
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Post #AyG5zUdESDoUEZzagy by [email protected] |
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@aeva https://aa.usno.navy.mil/publications/exp_supp roughly speaking it explai… |
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Post #AyG5zUkg0XlgbfTXIO by [email protected] |
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@fanf that sounds useful. looks like it is out of print though? |
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Post #AyG5zUr3cos8vSSdF2 by [email protected] |
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@aeva i got my copies from second hand mailorder bookshops, reasonably affordab… |
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Post #AyG5zVFABC9e8Djsoa by [email protected] |
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@aeva in case you havenāt found it already, jpl have loads of software for th… |
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Post #AyG622diz65WHrRDOa by [email protected] |
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@aeva plate tectonics causes a lot of problems for geodesy in new zealand š± … |
