How long can the moon cover a star?

The moon makes one revolution across the sky in 27.3 days (sidereal or sidereal month). This means that it passes its diameter of 0.5 ° in 27.3 days / (360 / 0.5) ≈ 0.91 hours ≈ 55 minutes. This is the maximum duration of the coverage (ie, eclipse) of a star by the Moon for an observer associated with the center of the Earth, or located in its polar regions. However, if the coverage is observed in the equatorial region, then as a result of the Earth’s rotation, the observer moves at a speed of 0.5 km / s in the same direction as the lunar shadow moves at a speed of 1 km / s (the orbital speed of the Moon). Therefore, for it, the coverage lasts twice as long, and its duration can reach almost two hours.

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