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2.4 Moon orbit

 

Frank L. Preuss

 

The moon moves at an average distance of 384 400 km on a elliptical orbit with an eccentricity of 0,0549 around earth. In the nearest point to earth (perigee) the distance is in the extreme case 356 410 km, in the point furthest from earth (apogee) 406 740 km.

The synodic month is the period of time between two moon phases of the same kind (for example from new moon to new moon) and lasts 29d 12h 44m 2.9s.

The moon phases take place as follows: At new moon the earth satellite is invisible. Its dark night side is turned to earth. About 2-3 days after that a waxing crescent emerges in the evening in the W. Rising and setting of the moon is late per day by about in average of 50 minutes. About 7 days after new moon is the first quarter (waxing half-moon), which on average stands in the S at sunset and sets at midnight. 14-15 days after new moon is full moon, which is visible the whole night. With a moon age of 22 days the last quarter (waning half-moon) follows, which rises on average about midnight and stands at sunrise in the S. Finally the waning crescent stands in the eastern morning twilight 2 to 3 days before new moon. Then the moon remains invisible for 4-5 days.

 

This is the end of "2.4 Moon orbit"
To the German version of this chapter: 2.4 Mond wann?

 

 

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