I'd like to determine the orbit of Earth's moon. Is Find_Orb a good tool for this project? I'll actually be doing observations via an iPhone; the camera is good enough to observe the moon (at least as a blob on screen), and the device can capture its orientation, GPS location, and the time of the observation. 

Right now I'm using some functions from Find_Orb to convert azimuth and elevation angles to right ascension and declination, although it looks like I'm not using them correctly: October 7, 2016, 20:14 UTC become Julian day 2457669.36330594, which day_to_dmy turns into 2016, 9, 24. 9 would make sense if the months were numbered 0-11, but that doesn't explain the day value. 

Thanks for your help and advice!