Eclipses Shadows Umbra - the darker part of a shadow where all the light is blocked Penumbra - a...
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Transcript of Eclipses Shadows Umbra - the darker part of a shadow where all the light is blocked Penumbra - a...
EclipsesEclipses
ShadowsShadows• Umbra - the darker part of a shadow
where all the light is blocked
• Penumbra - a partial shadow
• These terms also apply to Solar Eclipses and Lunar Eclipses.
Penumbra
Umbra
Partial Shadow
Full Shadow
Solar Eclipse
Sun
Moon
Earth
• A solar eclipse occurs when the Moon passes in front of the Sun.
Lunar Eclipse
Sun
EarthMoon
• A lunar eclipse occurs when the Moon passes into the Earth's shadow.
Questions
• Which type of eclipse is dangerous to view with the unprotected eye?
• Why are lunar eclipses more commonly seen than solar eclipses?
*
You will observe a total eclipse of the sun when...
(a) you stand in the penumbra of the moon’s shadow
(b) you stand in the umbra of the moon’s shadow
(c) sunlight diffracts around the moon
(d) sunlight reflects from the moon to the earth
(b) you stand in the umbra of the moon’s shadow