How do they work?
Use eyepiece to watch image
Lens collects light Use eyepiece to watch image
Mirror collects light
Large lens/mirror collects much light the diameter of the telescope is the important
By the way, what phase of the Moon is this?
What phase is this?
A lunar eclipse:
the shadow of Earth falls on the Moon (may occur at full moon - not every time) Same eclipse for everyone on Earth: once a year on average