Penumbra | www.MathEdPage.org
Penumbra | www.MathEdPage.org:
How it turns out that during a lunar eclipse, the penumbra’s width is about the same as the Moon’s diameter
Hey lies, remember our discussion about the lunar eclipse diagrams? It looks like we were right: the penumbra’s width is about equal to the Moon’s diameter and it’s because of the apparent sizes of the Moon and Sun being about the same. This site has a neat interactive diagram where you can change the apparent sizes of the Moon and Sun and move the Moon in its orbit.
Yeah, that’s really cool.
I like your comment about how we were right in our earlier speculation, especially the part where you graciously elided the portion of it in which I was talking complete nonsense. :-)
Reposted from http://ift.tt/1rlbjxB.
