Data input form MODIFIED from
"Celestial Navigation Data for Assumed Position and Time",
Astronomical Applications Department of the U.S. Naval Observatory.
Original here.

Date and time of observation:
Use UT (Universal Time). Specifically, the program assumes UT1.

Year:      Month:   January February March April May June July August September October November December    Day:  

Hour:   Minute:   Second:   UT

Celestial bodies of interest:

     (all, sun, moon, rigel, mercury, pluto, etc.)

Assumed position:

Enter best-estimate sea level coordinates.

Latitude:

north   south   ^{o   '}

Longitude:

east   west   ^{o   '}