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The Sun, Earth & Moon Patterns in the Sky

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Lunar Cycles Motions - PowerPoint PPT Presentation


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The Sun, Earth & Moon Patterns in the Sky. Lunar Phases. Lunar Phases. What is the phase of the Moon?. Full!. What time of day will the full moon set?. 6 a.m. West. East. Lunar Phases. What is the phase of the Moon?. Waning Crescent.

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PowerPoint Slideshow about 'Lunar Cycles Motions' - HarrisCezar


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Presentation Transcript
slide1

The Sun, Earth & Moon

Patterns in the Sky

slide3

Lunar Phases

What is the phase of the Moon?

Full!

What time of day will the full moon set?

6 a.m.

West

East

slide4

Lunar Phases

What is the phase of the Moon?

Waning Crescent

What time of day will the Waning Crescent be seen high in the sky?

9 a.m.

West

East

slide5

Lunar Phases

What is the phase of the Moon?

Waxing Gibbous

What time of day will this moon phase rise?

3 p.m.

When will this phase be near the western horizon?

2 a.m. or so

West

East

slide6

Synodic Period

Sun

Sidereal Period

Moon

slide7

Sidereal Lunar Period

  • One complete orbit around the Earth. Just one complete trip around to the same beginning location.
  • Moon\'s Sidereal Period is 27.3 days.

Synodic Lunar Period

  • Time between one full (new) moon until the next full (new) moon.
  • Earth is also revolving around the Sun!
  • We need to get the same orientation to get successive like moon phases.
  • Synodic period is 29.5 days.
  • (The month). "Moonth."
slide8

Lunar Motions

What is a trip across the sky for the moon?

Daily the moon rises in the East and sets in the West. (Westward)

  • Why?
    • Earth’s revolution is West to East!

West

East

slide9

Lunar Motions

What is a trip across the sky for the moon?

During the month the Moon moves EASTWARD across the sky!!

  • Why?
    • Moon’s orbit around the Earth during the Month!
    • Moon rises ~ 51min later each day.

Feb. 15, 9pm

Feb. 16, 9pm

Feb. 18, 9pm

Feb. 17, 9pm

Feb. 14, 9pm

West

East

slide10

Earthshine

We can actually view a small amount of glow from the un-lit portion of the moon. Sunlight manages to reflect off of the Earth and its atmosphere towards the moon. The light then bounces from the moon’s surface back to the Earth.

This gives observers on Earth the ability to slightly see the dark portion of the moon’s surface not in direct sunlight.

Leonardo DaVinci ~ 500 years ago.

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