Shadows
and Eclipses
Both the Earth and the Moon will cast
shadows. If the Sun, Earth, and Moon are all
lined up, then the shadow from one can fall on the other.
Because the Earth is ~4 times bigger, it
will cast a shadow 4 times bigger.
Umbra Portion of
shadow where it is completely dark.
(for a person in the shadow, the
light bulb would be completely blocked out)
Penumbra Portion of
shadow where it is only partially dark.
(for a person in the shadow, the
light bulb would be partially blocked out)
(To remember the names, think of “ultimate” and
“penultimate”)
From our text: Horizons, by Seeds