The Phases of the Moon. Is the Earth’s shadow is the cause of the Moon’s phases?
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The Phases of the Moon
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Transcript of The Phases of the Moon. Is the Earth’s shadow is the cause of the Moon’s phases?
The Phases of the Moon
Is the Earth’s shadow is the cause of the Moon’s phases?
NO
True Scale of Earth-Moon System:
Moon Takes About a Month (29.3 days) to go through all phases
Phases:
• New – Whole face is dark• Crescent – Looks like fingernail• First & Third Quarter -- Half lit• Gibbous – Latin gibbosus humpbacked• Full – Face is totally lit up
• Waxing – Getting Stronger (“wax poetic”)
• Waning – Getting Weaker (“on the wane”)
Moon Phases
Phases caused by Moon’s orbit around Earth
The time the moon is high above the southern horizon depends on what
phase it is in.;
When is the third quarter moon directly overhead?
• A. 6 AM• B. Noon• C. 6 PM• D. Midnight
When is the waxing crescent directly overhead?
• A. 9 PM• B. 3 AM• C. 9 AM• D. 3 PM
What time does the full moon rise?
• A. 6 AM• B. Noon• C. 6 PM• D. Midnight
The moon is full on March 30. What constellation is it in?
• A. Taurus• B. Virgo• C. Capricornus• D. Gemini
The Sun is in Gemini. You observe the moon is in Cancer. What phase is the moon in?
The zodiacal constellations in the order the sun and moon pass through
• Pisces• Aries• Taurus• Gemini• Cancer• Leo• Virgo• Libra• Scorpius• Sagittarius• Capricornus• Aquarius
A. first quarterB. third quarterC. waning crescentD. waxing crescentE. full
True Scale of Earth-Moon System:
Eclipses
Eclipses occur when Sun, Earth, Moon are in Syzygy (i.e. all three are in a line)
Moon in middle =“Solar eclipse”Earth in middle =“Lunar Eclipse”
• It is an eclipse of whatever body appears dark as seen from earth
Partial Eclipse – Moon not lined up to block out whole sun
Eclipse movie (click to start)
Where an Eclipse looks
Total, andWhere it
Looks Partial:
Annular Eclipse = Moon too far away to eclipse whole sun
During a solar eclipse, the moon must be in the ____ phase.
• A. Full• B. New• C. Crescent• D. Gibbous• E. First Quarter
Lunar Eclipse: Shadow of Earth Falls on Moon
During a lunar eclipse, the moon must be in the ____ phase.
• A. Full• B. New• C. Crescent• D. Gibbous• E. First Quarter
Moon’s orbit is tilted 5 degrees from the ecliptic plane
If the moon’s orbital plane was the same as the ecliptic plane, eclipses:
• 1. Would occur more often• 2. Would occur less often • 3. Would occur at the same rate
Eclipses would occur more often.Currently, can only occur when moon is at
“nodes” (where moon’s path crosses ecliptic)
If you were on the moon, you would see Earth go through phases.
What phase is the Moon in?1. New, 2. Cresc, 3. Quarter
4. Gibbous 5 Full
The Sun is in Pisces. You observe a first quarter moon. What constellation is it in?
The zodiacal constellations in the order the sun and moon pass through
• Pisces• Aries• Taurus• Gemini• Cancer• Leo• Virgo• Libra• Scorpius• Sagittarius• Capricornus• Aquarius
A. PiscesB. GeminiC. VirgoD.Sagittarius
The Sun is in Gemini. You observe a total lunar eclipse. What constellation is the moon in?
The zodiacal constellations in the order the sun and moon pass through
• Pisces• Aries• Taurus• Gemini• Cancer• Leo• Virgo• Libra• Scorpius• Sagittarius• Capricornus• Aquarius
A. PiscesB. GeminiC. VirgoD.Sagittarius
The moon is in the middle of a lunar eclipse on March 30. What
constellation is it in?• A. Taurus• B. Virgo• C. Capricornus• D. Virgo
