The moon's orbit plane (white plane) and the ecliptic plane (Earth's orbit plane) maintain 5. The angle between 145396 ° and the normal of the ecliptic is 1. An angle of 5424 °. Because the earth is not perfectly spherical, but rather uplifted at the equator, the white plane is constantly advancing (that is, the intersection with the ecliptic is rotating clockwise), every 6793. 5 days (18). 5966). During this period, the white road faces the equatorial plane of the earth (23. 45 ° inclines to the ecliptic). 60 ° (i.e. 23. 45 degrees +5. 15 °) to 18. 30 ° (i.e. 23. 45 degrees -5. 15 °). Similarly, the angle between the moon's rotation axis and the white path surface will be between 6. 69 ° (i.e. 5. 15 degrees +1. 54 °) and 3. 60 ° (i.e. 5. 15 degrees -1. 54 degrees). These changes in the orbit of the moon will in turn affect the inclination of the earth's rotation axis, making it appear ± 0. The oscillation of 00256 ° is called nutation.
白道面与黄道面的两个交点称为月交点--其中升交点(北点)指月球通过该点往黄道面以北;降交点(南点)则指月球通过该点往黄道以南。当新月刚好在月交点上时,便会发生日食;而当满月刚好在月交点上时,便会发生月食。
The two intersections of the ecliptic and the white plane are called the monthly intersection, where the ascending intersection (North Point) refers to the point through which the moon passes to the north of the ecliptic, and the descending intersection (South Point) refers to the point through which the moon passes to the south of the ecliptic. An eclipse occurs when the new moon is just at the point of intersection, and when the full moon is just at the point of intersection.
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