An eclipse occurs when the light of one celestial body is obscured by the other. With respect to earth, eclipse can be of two types- solar eclipse and lunar eclipse. These can be further classified into-total eclipse, partial eclipse, annular eclipse and hybrid eclipse. For these eclipses to occur, the sun, earth and moon must be aligned in a straight line. Solar eclipse occurs when the moon comes in between the sun and the earth, blocking the light of the sun. It occurs two to four times in a year, but only during a full moon day. A total eclipse occurs when the moon completely obscures the light from the sun. During annular eclipse the moon remains at quite a large distance from the sun. Hence the sun is not completely obscured and appears as a bright ring. An eclipse may appear as total eclipse at some place of the earth and as annular eclipse at some other place. Such eclipses are called hybrid eclipses and are very rare. Sometimes the sun and the moon do not lie in the same line resulting in partial eclipse. Lunar eclipse is witnessed when the moon passes through the earth’s shadow. It occurs only when there is a full moon with the earth lying between the sun and the moon. Unlike solar eclipse, lunar eclipse can be seen at any point on the earth’s surface and lasts for more than an hour.