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06/12/2014 – Ephemeris – Jupiter is making up for lost time and is heading rapidly eastward

June 12, 2014 Comments off

Ephemeris for Thursday, June 12th.  Today the sun will be up for 15 hours and 31 minutes, setting at 9:28.   The moon, 1 day before full, will set at 6:38 tomorrow morning.  Tomorrow the sun will rise at 5:56.

The planet Jupiter which is the brilliant star-like object in the west is starting to pick up its eastward motion in the stars.  Several months ago as the earth was passing Jupiter when it was rising in the east at sunset, it had stopped its eastward motion against the stars and headed westward.  This retrograde motion was due to Earth in essence passing the slower moving Jupiter.  Now that it’s on the other side of the sun Jupiter is making up for lost time because it and Earth are now moving in opposite directions.  This I see in the week to week setting times of Jupiter.  Stars rise and set 4 minutes earlier each night.  For Jupiter its down to three minutes, meaning it’s moving eastward.  When we see it again in December it will have blown past Cancer to Leo, but it will later backtrack into Cancer.

Times are for the Traverse City/Interlochen area of Michigan.  They may be different for your location.

Addendum

Jupiter in the next 180 days

Jupiter’s apparent motion over the next 180 days. Note by December Jupiter will slow and will begin its retrograde loop as the Earth catches up with it again. Created using Cartes du Ciel (Sky Charts).

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