The Saros Series is based on the positions of the Earth, Moon, and Sun. πβοΈ The cycle is about 6585.32 days long, or 18 years, 11 days, and 8 hours! This means that once an eclipse occurs, after this amount of time, a similar eclipse will happen, almost in the same place! π
The reason for this is how the Moon travels around the Earth, and the Earth around the Sun. During the Saros, geometry plays an important role; the Sun, Moon, and Earth need to align just right to create these spectacular events! π