The solar eclipse can be said to occur every ___ months on an average.
12
24
18
21
Due to the tilt of moon's orbit around the earth, the sun, moon and the earth fall in a straight line once every 18 months causing the solar eclipse.
A solar eclipse occurs on a ___ day.
Eclipses do not occur every month because the moon's orbit is
Complete the correct order for a solar eclipse to occur: Sun, ______, ______