Sometimes all or part of the sun is seen to be dark for a while , it is called solar eclipse. At the time of solar eclipse, less light from the sun falls on the earth. At one time people were afraid to watch the solar eclipse. Now it has decreased a lot. As the clouds move , so does the sun, and so does the moon. However, there is no rule for clouds but the moon moves according to a rule so that it can come in front of the regular earth and hide the sun. The moon is said to be between the earth and the sun on the day of the new moon , which is considered to be on the day of the new moon. Solar eclipses occur two to five times a year , this is called solar eclipse. Solar eclipses are never seen in the same period of time on Earth.