Traditional Culture Encyclopedia - Lucky day inquiry - Why isn't there an eclipse every full moon? There is a solar eclipse every day?
Why isn't there an eclipse every full moon? There is a solar eclipse every day?
In other words, the sun, the earth and the moon are just right at this time.
(or something like that)
On the same straight line (the earth is between the sun and the moon), so the light from the sun to the moon will be blocked by the earth.
As far as the earth is concerned, when an eclipse occurs, the direction of the sun and the moon will be different.
180
Degree, so the solar eclipse must occur in the "king" (that is, around the lunar calendar 15 years). It should be noted that due to the orbits of the sun and the moon in the sky.
(called ecliptic and white)
Not on the same plane, but about.
five
Degrees intersect, so only when the sun and the moon are located near the intersection of the ecliptic and the ecliptic, will they have a chance to connect in a straight line and produce an eclipse.
The first loss: marks the beginning of the solar eclipse. The moon slowly entered the shadow from the eastern edge, and the umbra of the moon and the earth was delineated for the first time.
Eclipse: The western edge of the moon is inscribed with the western edge of the Earth's umbra, and the moon just enters the Earth's umbra.
Eclipse: The center of the moon is closest to the center of the Earth's umbra.
Luminescence: the eastern edge of the moon is inscribed with the eastern edge of the umbra of the earth, and the total solar eclipse phase ends at this time.
Final contact: the western edge of the moon is tangent to the eastern edge of the umbra of the earth. At this time, the whole eclipse was over.
The degree of eclipse is called "eclipse", which is equal to the ratio of the farthest distance from the edge of the moon wheel to the umbra of the earth and the meridian of the moon when the eclipse is serious.
End of the penumbra eclipse: The moon leaves the penumbra, and the whole eclipse process officially ends. ...........................................
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