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Stellarium program moon phase9/4/2023 ![]() ![]() You may be able to use a much simpler method to compute the position of the moon though for my purposes I needed arcsecond accuracy. Some of the tables are therefore redundant and aren't used. Initially I was inputting the formulas by hand from the book I cited in the video, but the process was rather error-prone so I ditched those tables and simply scanned the pages electronically and used the numbers from the scans to construct the tables of the Fourier series used to compute the moon's position. It's a bit complicated, to say the least. Not to sound clueless and needy, but the question talks about formulas, which I know can be derived from the spreadsheet, however as I have no idea how to approach this, then the answer I was hoping for would help a bit more. PS! First post here, so I hope I have used the correct terminology for things.ĮDIT: Eventhough the author of the spreadsheet left an answer to the topic, it doesn't feel like it really answers the question. My goal is to understand how this type of calculation is done, in order to re-implement it in code for an application to use - displaying the typical crescent moon icon for night-time, but at the correct angle for a specific location and time. I'm most interested in determining the illuminated phase (i.e the size of the bright limb) and the apparent orientation of the illuminated portion relative to the horizon. I would greatly appreciate if someone with a bit more experience could decipher the spreadsheet a bit and perhaps write down or link me to the formulas being used. I've located this video and the accompanying spreadsheet that supposedly handles this sort of calculation, however I am somewhat confused on what formulas are actually used. The phase of the Moon (the bright limb) looks different depending on where on Earth the observer is located and the time of the observation. ![]()
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