lunar motion & eclipses. lunar phases caused by moon’s changing position around the earth see...
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Phases of the MoonTRANSCRIPT
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Lunar Motion & Eclipses
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Lunar Phases• Caused by Moon’s changing position around
the Earth
• See dif. portions of the lit half of Moon
• Waxing phases: from new moon to full moon, right side of moon becomes illuminated
• Waning phases: from full to new moon, left side is illuminated & see less of the moon.
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Phases of the Moon
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Synchronous Rotation• Same side of the Moon faces Earth
always
• Because Moon rotates at the same speed it revolves
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General Motion Statistics• Lunar month: time it takes to go
through cycle of phases (29.5 days)
• 27.3 days for moons orbit
• Rises and sets 50 min. later ea. Day
Remember the same side of the moon always faces Earth
?Why?
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Lunar Month vs. Orbital Period
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General Motion Statistics• Moon’s orbit is tilted ~5o (reason
for infrequent eclipses)
• Perigee: Moon closest to Earth
• Apogee: Moon farthest from Earth
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Moon’s Orbit
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TidesBulge of ocean water on both sides of Earth
caused by Moon’s gravitational pull
• Spring tide: Moon & Sun cause higher than normal high tides, and lower low (full & new Moon)
• Neap tides: Moon at 90o angle to Sun, difference btwn high and low are not as drastic (Qtr. Phases)
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Tides and Phases
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Eclipses• Light is blocked from an object, which
causes a shadow on it
• Solar eclipse: Moon’s shadow cast on Earth (can’t see Sun)
• Lunar eclipse: Earth’s shadow cast on the Moon (still see moon, but appears reddish in sky)
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Eclipses cont’d• Partial eclipse when observer isn’t
under the concentrated shadow
2 regions of Moon’s shadow• Umbra: Moon’s concentrated shadow
~100mi wide (total eclipse)• Penumbra: Moon’s diffuse shadow
(partial eclipse)
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Solar Eclipse
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Solar Eclipse
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Lunar Eclipse