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Jupiter Moon Event Time Discrepancies (Light Time Travel)

I've just noticed some discrepancies in the times of the following Jan 1 2018 events for Io and Ganymede:

 

From earth:

Ganymede eclipse begins 4.52 am

Ganymede eclipse ends 6.58 am

Io eclipse begins 7.08 am

 

Object Info (Jupiter):

Ganymede eclipse begins 5.02 am

Ganymede eclipse ends 6.48 am

Io eclipse begins 7.08 am

 

Orbit Object (Jupiter):

Ganymede eclipse begins 4.03 am

Ganymede eclipse ends 6.08 am

Io eclipse begins 6.18 am

4 comments

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    Bill Tschumy

    All the data in the object info is computed relative to where you are.  So it will be different if you are on Earth compared to when orbiting Jupiter.  I don't quite understand what you are doing with the first two cases.  Is one what you see in these chart itself and the other what Object Info shows?

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    Other Sparrow

    Oh, light travel time from earth to Jupiter...on earth I would see those events later than when they occurred.

    Yes, the first two cases are what I see in the chart itself (Time Flow) vs the event times in Object Info.

  • 0
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    Bill Tschumy

    With respect to the first two entries being different, I believe this is because we have to take some sort cuts in calculating future moon events.  The chart is the one that is correct but I am surprised to see them differ by 10 minutes.  That does seem a bit excessive.  I will look into it.

  • 0
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    Bill Tschumy

    The newly released 6.0.1 version improves the accuracy to the Jovian moon event times reported in the Object Info.  Previously they could be off several minutes but now they should be accurate to within less than a minute.

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