Eclipse

An interception or obscuration of the light of the sun moon or other luminous body by the intervention of some other body either between it and the eye or between the luminous body and that illuminated by it A lunar eclipse is caused by the moon passing through the earths shadow a solar eclipse by the moon coming between the sun and the observer A satellite is eclipsed by entering the shadow of its primary The obscuration of a planet or star by the moon or a planet though of the nature of an eclipse is called an occultation The eclipse of a small portion of the sun by Mercury or Venus is called a transit of the planet