Moon numbers

[ root ]

Type the UT date and time in the first box below, and then press the 'calculate' button. The program will calculate various parameters for the Moon at the instant you have chosen.

Save this page to your hard drive for use off-line - it will still work. Explore the program by loading the page into a text editor. My excursion into Javascript was prompted by an article called 'Scripting: A programming alternative' by David Benn in the March 2000 issue of Sky and Telescope. Arkkana Peck has written a nicely presented Javascript moon ephemeris that tells you the Rukl chart numbers currently on the terminator in the form of a table representing the face of the Moon.

Type in the UT date and time
Date format: The date 21st Feb 2000 at 23:50 is entered as 20000221.2350
Enter UT date in yyyymmdd.hhmm format -:

Results: Physical Ephemeris of Moon
Selenographic longitudes towards Mare Crisium are taken as positive. All figures here are based on geocentric coordinates, and position angles relate to the North Celestial Pole.
Libration in Latitude (B) -:
Libration in Longitude (L) -:
Colongitude of the Sun (Co) -:
Subsolar point Lat (Bo) -:
Subsolar point Long (Lo) -:
Selenographic Longitude of terminator -:
Illuminated fraction of Moon's disc -:
Position angle of bright limb -:
Position angle of polar axis -:
Results: Time
Days since J2000.0 -:
Julian Day Number -:
Results: Sun's position
Distance (AU) -:
Right Ascension -:
Declination -:
Results: Moon's position
Distance (Earth radii) -:
Right Ascension -:
Declination -:

Hacked together by: Keith Burnett [ please report any problems with the script ]
Last modified: 22 February 2000