Celestial Portraits

Solar System Almanac Calculator

Solar System Almanac Online Calculator

Updates: The calculator currently pre-calculates the local time for you already and outputs in UTC. Please note that if the observer wishes to choose another date/time input, it must be chosen in UTC.
Presentation of the almanac results will be done as soon as the calculation algorithms are verified. Please be patient! :)
Updates 1: Included lunar phase calculation. Lunar perigee and apogee dates verified.
Updates 2: Included solar calculations. Inserted rise and set times for planets.
Updates 3: Included Jovian satellites positional determinants.
Updates 4: Included Saturnian satellites positional determinants. Not verified.
Updates 5: User input for latitude and longitude now enabled.
Updates 6: Saturnian satellite positions verified for first five satellites.
Updates 7: Added calculations for Great Red Spot transit times for Jupiter.

Date (UTC):

Time (24-hour format):

Geographical Location:

Custom Latitude: Custom Longitude:

Celestial Object:

Apply Bennett Refraction Correction for altitude