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日与月日食和月食是一种自然现象,它们的发生是有规律的。日食总是发生在新月朔日(农历初一),月食总是发生在满月望日(农历十五或十六)。因为在每月的朔或望日,太阳、月球和地球三者正好位于或接近同一条直线,这时月球和地球才有可能分别遮住太阳的光线,形成日食或月食。不过,由于月球和地球的轨道并不在同一个平面上,而是有5度9分的交角,因而并不是每个月的朔、望日都会发生日食或月食。
Sun and Moon Solar eclipse and lunar eclipse are natural phenomena and their occurrence is regular. The eclipse always occurs on the New Moon Day (Lunar New Year), and the eclipse always occurs on Full Moon (Lunar New Year or XVI). Because in the new moon or moon, the sun, the moon and the earth are all at or near the same straight line, then it is possible for the moon and the earth to cover the sun’s rays and form the solar eclipse or the eclipse respectively. However, since the orbits of the Moon and the Earth are not in the same plane but have an angle of 5 degrees and 9 minutes, they are not the new moon every month.