# Figuring out which moons of Jupiter I saw through my telescope

Three days ago (Sunday 11st March) in London using my new telescope I was able to see Jupiter and three of its moons. It was very clear and easy to spot. How can I determine the names of the moons I saw (and which one was which)? I would assume they were the Galilean moons - as they are the largest, making the easily visible, however, I am not sure which moons I would have seen.

This is how they lined up through the ‘scope :

.

  .
O
.


where .=moon & O= Jupiter

Any help would be appreciated.

Thanks

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Jupiter's inner moons move fast enough that, in addition to the date, you really need the time (in UTC or with local timezone) as well. –  Dan Neely Mar 13 '12 at 17:30