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Astronomical question and answer 242

 

Frank L. Preuss

 

With what speed does the moon move on its orbit around the earth?

 

The moon is 400 000 km away from us. The diameter of its orbit is twice as that of the radius, therefore 800 000 km.

The length of the orbit is then 800 000 times π = 2 512 000 km.

The moon takes 29.53 days for one revolution, see 31. And that is 29.53 times 24 = 709 hours.

The speed of the moon on its orbit is then 2 512 000 km / 709 h = 3 544 km/h.

 

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To the German version of this chapter: Astronomische Frage und Antwort 242

 

 

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