Eclipses - Quia
Transcript of Eclipses - Quia
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Eclipses
A penny will hide the biggest star in the
universe if you hold it close enough to your
eye.
-- Samuel Grafton
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Solar Eclipses
The Sun is vanishing! The Sun is going out! The daylight is retreating!
Bad Omens All! The Gods are MAD!
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The Moon is just close enough, and just big enough, to block our
view of the sun = SOLAR ECLIPSE.
Only the sun’s CORONA is visible
If the Moon was A)
smaller, or B) farther
from us, would we
experience TOTAL
solar eclipses?
ANNULAR ECLIPSE – when moon is
farthest from Earth – some sun visible
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The Modern View
The answer lies hidden among the shadows.
Earth
Moon
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Shadow Structure
Penumbra
Penumbra
Umbra
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South
Pole
North
Pole
Solar Eclipse Details
Sun Moon
What is the phase of the moon?
New Moon!
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Total Solar Eclipse
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A Total Solar
Eclipse from
beginning to end
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Why not a solar eclipse every month then?
Sun
Ecliptic
Moon
Moon’s
Orbit
Earth 5o
Moon's orbit is tilted about 5o with respect
to the Earth's orbit (ecliptic), so the
shadows usually miss!
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But, the Moon passes through the ecliptic, and
is found along the line of nodes, twice a month.
*IF* at new moon - SOLAR ECLIPSE
probability.
*IF* at FULL moon - LUNAR ECLIPSE
probability.
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If line of nodes points to the sun during new or full moon phases; ECPLIPSE!!!
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A Lunar Eclipse
Moon
Sun Earth
Moon’s
Path A lunar eclipse occurs when the
Earth lies between the Sun and
Moon, so that Earth's shadow
darkens the Moon.
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The moon becomes a blood red color during a total lunar
eclipse. No wonder that ancient cultures feared the appearance
of the moon during a lunar eclipse.
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Earth’s Atmosphere
Sunlight
Moon
Earth
The Blood Moon
The moon often does not totally disappear during a total lunar eclipse.
Instead it can be seen as a very dark red color because of the refraction of
sunlight through the Earth's atmosphere.
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The End