释义 |
phases of the Moon
phases of the MoonThe Moon produces no light of its own: it shines because it reflects sunlight. The amount of the lit half that can be seen from the Earth changes from day to day. These regular changes are known as phases of the Moon. The interval between one new Moon and the next is 29 days, 12 hr, 44 min, 3 sec.
phases of the moon
phases of the moonThe moon derives its light from the sun. Its apparent shape, or phase, depends on the angle at which the illuminated hemisphere is presented to the earth, which in turn depends on the position of the moon with respect to the earth and the sun. See age of the moon. |