In this episode, Dave Eicher invites you to observe the annular eclipse that will occur October 2. Annular eclipses occur when the Sun, the Moon, and Earth line up, in that order. But in this case, the Moon is either too far from Earth (so it appears smaller) or Earth is too close to the Sun (so it looks bigger). The result isn’t a total eclipse, but one with a ring of the Sun’s disk around the Moon.