Moon’s sidereal period of revolution is about 277, days and it moves eastwards with reference to the  stars and at an average of more than half a degree per hour. In its movement, it continually interposes  its  disc between us and the stars. The sudden disappearance of a star by the Moon’s disc is caslled  the occultation of the star by the Moon.
Actually, the covering up of one celestial body by mother is generally called occultation. Strictly peaking, the- solar eclipse is also an occultation of the Sun by the Moon.

Comments are closed.