Final answer:
During an annular eclipse, the Moon is farther than usual from Earth and cannot completely cover the Sun.
Step-by-step explanation:
An annular eclipse of the Sun occurs when the Moon doesn't quite cover the Sun in the zone of totality. This happens because the Moon looks slightly smaller than the Sun and cannot cover it completely, even if they are perfectly aligned. As a result, a ring of light appears around the dark sphere of the Moon during an annular eclipse.
This means that the Moon is farther than usual from Earth during an annular eclipse because it cannot completely cover the Sun due to its smaller apparent size.