The Mudcat Café TM
Thread #134352   Message #3060513
Posted By: Keith A of Hertford
24-Dec-10 - 04:11 AM
Thread Name: 1st solstice/lunar eclipse in 500 years
Subject: RE: Lunar Eclipse
The sun is about 400 million times bigger than the moon, but also about 400 million times further away.
Thus they appear the same size in the sky, and the moon exactly covers the sun in a solar eclipse.
This is just held to be an amazing cosmic coincidence.

The earth's shadow is much bigger than the moon, and the curvature of the edge of it is visible as it crosses the moon in a lunar eclipse.