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Jupiters Great Red Spot Calculator:

 
Predicting the best time to view the Great Red Spot on Jupiter is now easy with this little program.
It tells you the time when the storm is crossing the meridan (center) of the planet, the time it's best viewable from Earth.


Please enter a date:
(mm/dd/yyyy)

Universal Times
of Red Spot transits
centred on date:

Corresponding
local dates & times
of Red Spot transits:


Note: local times are based on a time zone offset of
  hour(s) from UT as given by your Web browser.

CM I / II / III Longitude Calculator:

UTC Date (DD MM YYYY):

UTC Time (HH MM):

Julian Date: