The culmination of Neptune at the latitude of Moscow on December 1, 2017 will occur at 18 hours 40 minutes, the planet will go beyond the horizon at 23 hours 55 minutes. When did the planet rise on December 1 and when will it rise on December 5?
1) (calculated sunrise time 1)
The times between climax and sunrise and climax and set are equal for distant objects. That is, on December 1, Neptune rose at 18h40min – (23h55min-18h40min) = 13h25min.
2) (calculated sunrise time 2)
The time interval between two ascents for distant objects is equal to a sidereal day (the period of the Earth’s rotation), that is, 23h56min. Thus, Neptune will rise on December 5 (four days after December 1) at 13h25min-4 * 4min = 13h09min.
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