The star rose at 00h01m local time. How many times will it cross the horizon at a given point on this day?
| September 17, 2020 | Education
Sidereal days, equal to the period of rotation of the Earth relative to fixed stars, are slightly shorter than solar days and are equal to about 23 hours 56 minutes. Therefore, this star will have time to go beyond the horizon in this day and re-ascend at 23 hours 57 minutes local time, that is, it will cross the horizon twice more (unless, of course, in the remaining three minutes the star does not go back over the horizon).
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