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
-
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
-
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
I just want to calculate the current direction of tidal force from the observer's earth-relative position in space and time is that so wrong
-
I just want to calculate the current direction of tidal force from the observer's earth-relative position in space and time is that so wrong
@aeva oh boy. I went down the rabbit hole of calculating star positions a few years ago, and the whole thing is... convoluted. Step one was calculating the Earth Rotation Angle, and that was... urgg
-
@aeva oh boy. I went down the rabbit hole of calculating star positions a few years ago, and the whole thing is... convoluted. Step one was calculating the Earth Rotation Angle, and that was... urgg
@jon_valdes my hope was that the moon's position relative to the earth would be the one situation where geocentrism still holds enough water for a useful approximation, but I'm starting to think that this is a problem space where people don't typically seek useful approximations
-
@jon_valdes my hope was that the moon's position relative to the earth would be the one situation where geocentrism still holds enough water for a useful approximation, but I'm starting to think that this is a problem space where people don't typically seek useful approximations
@aeva what I found is most methods for calculating these things are approximations that break down if you deviate from the year 2000 by more than 5 millenia or something. It just depends on what you consider a "useful" approximation
-
@aeva what I found is most methods for calculating these things are approximations that break down if you deviate from the year 2000 by more than 5 millenia or something. It just depends on what you consider a "useful" approximation
@jon_valdes oh that's great. I figure for my use case it only has to be moderately accurate for the remainder of my lifespan however short or long that may be, and it's not really my problem if it accumulates a bit of drift after that
-
@jon_valdes oh that's great. I figure for my use case it only has to be moderately accurate for the remainder of my lifespan however short or long that may be, and it's not really my problem if it accumulates a bit of drift after that
@aeva perhaps the easiest way would be to look at how other programs do it. I spent a bunch of time reading code for Stellarium, for example. Perhaps that, or a website like this could help you?
https://eyes.nasa.gov/apps/orrery/#/moon?time=2025-09-10T04:57:12.041+00:00 -
@aeva perhaps the easiest way would be to look at how other programs do it. I spent a bunch of time reading code for Stellarium, for example. Perhaps that, or a website like this could help you?
https://eyes.nasa.gov/apps/orrery/#/moon?time=2025-09-10T04:57:12.041+00:00@jon_valdes i found this a few hours ago http://www.geoastro.de/elevazmoon/basics/index.htm haven't had a chance to look at it in detail but it looked promising at first skim
-
@jon_valdes i found this a few hours ago http://www.geoastro.de/elevazmoon/basics/index.htm haven't had a chance to look at it in detail but it looked promising at first skim
@aeva @jon_valdes I'm trying to remember what program we use to generate location accurate star charts in Avatar and Division... Maybe it can do the moon as well, will look it up later.
-
@aeva @jon_valdes I'm trying to remember what program we use to generate location accurate star charts in Avatar and Division... Maybe it can do the moon as well, will look it up later.
@aeva @jon_valdes alright I think we just use data from sdss and reproject it for alpha centuri, blindly extrapolating for the correct date using the star velocity. so no complex orbital mechanics. However for the planetary bodies in solar system we use code derived from https://stjarnhimlen.se/comp/ppcomp.html
-
@aeva @jon_valdes alright I think we just use data from sdss and reproject it for alpha centuri, blindly extrapolating for the correct date using the star velocity. so no complex orbital mechanics. However for the planetary bodies in solar system we use code derived from https://stjarnhimlen.se/comp/ppcomp.html
Word of caution about calculating these things on the GPU: implementations of trigonometric functions on the GPU are less accurate than you'd hope, and if you calculate a bunch of sin() and cos() for your view direction per pixel, they turn out not to be accurate enough for stable movement across a 60° fov on a 4K screen. Particularly Intel, which seems to barely pass the D3D precision requirements there...
-
Word of caution about calculating these things on the GPU: implementations of trigonometric functions on the GPU are less accurate than you'd hope, and if you calculate a bunch of sin() and cos() for your view direction per pixel, they turn out not to be accurate enough for stable movement across a 60° fov on a 4K screen. Particularly Intel, which seems to barely pass the D3D precision requirements there...
@jon_valdes @aeva right, yeah I should also mention all that is done on the cpu, and with double precision. I'm not really sure if you can even squeeze it to work with f32.
-
@jon_valdes @aeva right, yeah I should also mention all that is done on the cpu, and with double precision. I'm not really sure if you can even squeeze it to work with f32.
-
@jon_valdes @dotstdy blessedly I'm planning on doing this on the cpu, but
-
@jon_valdes @dotstdy blessedly I'm planning on doing this on the cpu, but
-
@jon_valdes @dotstdy my laptop has a recent-ish Xe gpu
-
@jon_valdes @dotstdy my laptop has a recent-ish Xe gpu
@jon_valdes @dotstdy it's bizarre seeing my 10 year old telephone's mali do better at... anything at all
-
@jon_valdes @dotstdy it's bizarre seeing my 10 year old telephone's mali do better at... anything at all
@jon_valdes @dotstdy though I guess the corner the intel case is cutting is where the slope starts to level out so I guess that makes sense. are CPU trig functions just as bad?
-
@jon_valdes @dotstdy though I guess the corner the intel case is cutting is where the slope starts to level out so I guess that makes sense. are CPU trig functions just as bad?
@jon_valdes @dotstdy would mollytime get a warmer, fuller sound if i switched to expensive software sine waves :3
-
@jon_valdes @dotstdy would mollytime get a warmer, fuller sound if i switched to expensive software sine waves :3
@aeva @jon_valdes generally cpu trig is not so bad, but does vary between platforms if you're just calling the c stdlib functions (but we're talking differences of 1 ulp or so). so yes, absolutely you can get a warmer fuller soundstage by switching to a different sin.
Gli ultimi otto messaggi ricevuti dalla Federazione
-
@adriananselmo eh già. Io ho provato e riprovato più volte ad entrarci ma, come si vede anche dall’immagine che hanno utilizzato per il link, è proprio fatto male. L’usabilità, la grafica ti fa pensare che c’è qualcosa che non va.
-
@ro @eccosilvia a Gaza è genocidio tutto il resto sono cazzate...
-
@antilopefusa @extratrek @Godai71
L'episodio finale è, come molti di questa stagione, un'idea interessante ma sviluppata male; parlo di coerenza, non di romanticismo (in senso lato) che è inequivocabile.Ammp questa stagione rimane sotto tono rispetto alle altre, e "Capitan Marvel Batel"
ne è la "degna" conclusione. Un plauso alla colonna sonora, "Wait" degli M83 (quelli di "Oblivion" con Tommaso Crociera).
P.S. i rimandi ad altro ST ed oltre sono talmente tanti che stordiscono.
-
@eccosilvia è una persona molto intelligente. Appunto, non è una questione di mancanza di rispetto, le identità sono libere di esistere. Le etichette ghettizzano e non uniscono. Il dolore di perdere un figlio è disumano, pare sia difficile pure definire quello che sta accadendo a Gaza, se genocidio o no...
-
@eccosilvia sarà che io invece la considero una grande ipocrita e neanche mi piace la Gheno che invece è stata promotrice dello schwa. Credo comunque che il tuo esempio non regga. Non si tratta di definire una situazione particolare ma di uscire dal concetto di normalità e binarismo di genere, entrambi condizionamenti culturali... illuminante in questo senso è Questioni di un certo genere de Il Post...
-
@ro @adriananselmo
Ho una buona opinione di Chiara Valerio, la trovo sempre molto attenta al tema delle varie identità e che se ne porti rispetto. La ascolto anche per saperne di più in merito. Mi è chiaro che, essendo in linea con la lingua che mi definisce, mi avvalgo della fortuna di non sentirmi esclusa. Non significa però che voglia appositamente ignorare o negare che esistano altre identità, perchè non uso la schwa. Penso pure che non esiste termine per un genitore che perde il figlio.
-
@evadm le recensioni non ne parlano benissimo...
-
Riescono a rigirare qualsiasi cosa a loro vantaggio, temo siano imbattibili.
Nel Regno Unito sono necessari uno "scioglimento del Parlamento" e un "cambio di governo". Lo ha detto Elon Musk in videocollegamento col palco della manifestazione organizzata dall'estrema destra a Londra. "Non si può: non abbiamo altri quattro anni, o quando ci saranno le prossime elezioni, è troppo tempo. Bisogna fare qualcosa", ha dichiarato il tycoon riferendosi all'esecutivo laburista di Keir Starmer con cui in passato è entrato più volte in polemica. Ha poi dichiarato che "la sinistra è il partito della violenza e dell'omicidio", riferendosi all'assassinio di Charlie Kirk negli Usa.
