https://www.lexaloffle.com/bbs/?uid=28919 <p> <table><tr><td> <a href="/bbs/?pid=51247#p"> <img src="/bbs/thumbs/pico51245.png" style="height:256px"></a> </td><td width=10></td><td valign=top> <a href="/bbs/?pid=51247#p"> Solar System Orrery 1.0</a><br><br> by <a href="/bbs/?uid=28919"> mcneja</a> <br><br><br> <a href="/bbs/?pid=51247#p"> [Click to Play]</a> </td></tr></table> </p> <p>Super simple solar system. Left/right to adjust time, up/down to adjust zoom.</p> <p>This is a port of an orrery I wrote in C++ back in 2003 or so. It was fun trying to cram it into the Pico-8, with its limited numeric precision.</p> <p>Printing the date proved to be more of a challenge than just about anything else. I haven't tried to write the reverse function yet (year/month/day to Julian day number) so the cartridge just starts up somewhere near the beginning of the current year.</p> <p>Not recommended to plan horoscopes or Mars missions with this thing, but compare it with <a href="https://ssd.jpl.nasa.gov/?ss_inner">https://ssd.jpl.nasa.gov/?ss_inner</a> or <a href="https://ssd.jpl.nasa.gov/?ss_outer">https://ssd.jpl.nasa.gov/?ss_outer</a>, which is where I got the orbital elements from.</p> <p>Putting a Lambert solver in so you could plan Mars missions (despite what I just said) would be a fun next step.</p> https://www.lexaloffle.com/bbs/?tid=31077 https://www.lexaloffle.com/bbs/?tid=31077 Tue, 03 Apr 2018 08:22:39 UTC