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A comment on What made Earth a giant snowball 700M years ago? Scientists have an answer. Parent comment
Technically you need a bit more than that, for its umbra to block out the entire photosphere over the entire Earth:
https://en.wikipedia.org/wiki/Tangent_lines_to_circles#Outer...
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Technically you need a bit more than that, for its umbra to block out the entire photosphere over the entire Earth:
https://en.wikipedia.org/wiki/Tangent_lines_to_circles#Outer...