The Phases of the Moon

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The Phases of the Moon
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Is the Earths shadow is the cause of the Moons
phases?
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NO
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True Scale of Earth-Moon System
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Moon Takes About a Month (29.3 days) to go
through all phases
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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

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• Waxing Getting Stronger (wax poetic)
• Waning Getting Weaker (on the wane)

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Moon Phases
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Phases caused by Moons orbit around Earth
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LT 79,80,81
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One evening you go out and seen the full moon in
the constellation Taurus. Two months later, you
see the full moon again. It is

• A. Still in Taurus
• B. In a different constellation
• C. It might be in Taurus, or a different
  constellation.

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The time the moon is high above the southern
horizon depends on what phase it is in.
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When is the third quarter moon directly overhead?

• A. 6 AM
• B. Noon
• C. 6 PM
• D. Midnight

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When is the waxing crescent directly overhead?

• A. 9 PM
• B. 3 AM
• C. 9 AM
• D. 3 PM

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What time does the full moon rise?

• A. 6 AM
• B. Noon
• C. 6 PM
• D. Midnight

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The moon is full on March 30. What constellation
is it in?

• A. Taurus
• B. Virgo
• C. Capricornus
• D. Gemini

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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

1. first quarter
2. third quarter
3. waning crescent
4. waxing crescent
5. full

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LT 83,84,85
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The Earths shadow is the cause of the Moons
phases

• A. Yes
• B. No

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True Scale of Earth-Moon System
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Eclipses
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Eclipses occur when Sun, Earth, Moon are in
Syzygy (i.e. all three are in a line)
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Moon in middle Solar eclipseEarth in middle
Lunar Eclipse

• It is an eclipse of whatever body appears dark as
  seen from earth

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Partial Eclipse Moon not lined up to block out
whole sun
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Eclipse movie (click to start)
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Where an Eclipse looks Total, andWhere it
Looks Partial
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Annular Eclipse Moon too far away to eclipse
whole sun
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During a solar eclipse, the moon must be in the
____ phase.

• A. Full
• B. New
• C. Crescent
• D. Gibbous
• E. First Quarter

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Visualize 4 Layers
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Lunar Eclipse Shadow of Earth Falls on Moon
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During a lunar eclipse, the moon must be in the
____ phase.

• A. Full
• B. New
• C. Crescent
• D. Gibbous
• E. First Quarter

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Moons orbit is tilted 5 degrees from the
ecliptic plane
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If the moons 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

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Eclipses would occur more often.Currently, can
only occur when moon is at nodes (where moons
path crosses ecliptic)
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If you were on the moon, you would see Earth go
through phases.
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What phase is the Moon in?1. New, 2. Cresc, 3.
Quarter 4. Gibbous 5 Full
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In the movie Apocalypso, the main character is
saved by a solar eclipse during one day, and runs
by the light of the full moon that night. Is
that possible?

• A. Yes
• B. No

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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. Pisces
• Gemini
• Virgo
• Sagittarius

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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. Pisces
• Gemini
• Virgo
• Sagittarius

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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