System Rotational degrees (in decimal degrees) per day
I 877.8169147 (877° 49' 00.00")
II 870.1869147 (870° 09' 24.89")
III 870.4529147 (870° 27' 10.49")

Enter the Date and Time to compute Jovian CM longitudes

Enter Date of Observation formated MMDDYYYY: e.g. 01012005
Enter Time (UT) of Observation formatted HHMM e.g. 0341