Ugh, I get flashbacks to one of my astronomy intro courses and having to memorize conversion formulas between horizontal (azimuth/altitude), equatorial (RA or h

Ugh, I get flashbacks to one of my astronomy intro courses and having to memorize conversion formulas between horizontal (azimuth/altitude), equatorial (RA or hour angle/declination), and ecliptic (ecliptic long/lat) coordinate systems. Fun times.