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Moon Phases

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Moon Phases & Eclipses What patterns, motions, and events do we notice in the sky? What theories can we create to explain them? How can these theories be tested? – PowerPoint PPT presentation

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Title: Moon Phases


1
Moon Phases Eclipses
  • What patterns, motions, and events do we notice
    in the sky?
  • What theories can we create to explain them?
  • How can these theories be tested?

2
Observations of the Moon
  • Sequence of phases every moonth
  • We always see the same face

3
Observations of the Moon
  • Occasionally turns dark gray even red!
  • Can seem bigger next to the horizon!

4
  • Phases repeat 30 days
  • A moonth of time
  • Tied to religious calendars around the globe
  • Ramadan
  • Chinese New Year
  • Easter
  • Rosh Hashanah
  • Gudi Padwa Vasant Panchami

5
Observations of the Moon
  • A sequence of repeated phases over about a
    moonth

6
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7
Observations of the Moon
  • IS the phase the same on the same day around the
    world?
  • Do people in London see the same phase as we do
    in Hayward?

8
Observations of the Moon
  • IS the phase the same on the same day around the
    world?
  • Most people would say NO!
  • They are wrong!
  • Compare times
  • For Earth to rotate hours
  • For the Moon to move change phase days

9
Observations of the Moon
  • Do people in both hemispheres see the same view?
  • Does an observer at Chabot see the same thing as
    someone in Santiago, Chile?
  • Most people would say erYES?
  • They are wrong!

10
  • Phases are reversed in Southern Hemisphere!
  • Same side of moon is still lit by the sun
  • Observation from down under reverses view.

11
Seeing the moon from different places on Earth!
12
Seeing the moon from different places on Earth!
Northern Hemisphere
Southern Hemisphere
13
The Moon Illusion!
14
The Moon Illusion!
15
What theories can we develop?
  • WHY does the moon seem larger?
  • Because it IS larger?
  • Because it is an illusion
  • We see horizon different than zenith?
  • We dont have a reference for Moon when its
    higher in the sky?
  • How can you TEST these hypotheses?

16
The Moon Illusion!
The Moon DOES vary in distance.
17
The Moon Illusion!
.but not over a few hours!
18
The Moon Illusion!
Perhaps we dont see the sky as symmetric the
horizon is farther away than the sky above us?
19
Solar Eclipses
  • Occur at NEW moon phase
  • While partial, a bite out of the Sun
  • Last 1 hours
  • IF total
  • Sky goes dark for a few minutes
  • See planets and stars near the sun
  • See Suns corona and chromosphere

20
  • Shadow of
  • the moon
  • covers small
  • oval on Earth

21
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22
Corona
Chromosphere
23
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24
Annual Solar Eclipse
  • Time-lapse series of photos
  • What time of day?
  • How long did this take?
  • Hint Northern Hemisphere!

25
Lunar Eclipses
  • Occur at FULL moon phase
  • The Moon looks full, but dim
  • The Earths curved shadow falls across the moon
  • Last 2 hours
  • IF total
  • Moon can look red for an hour

26
At the start of a lunar eclipse, you can see the
Earths Shape through its shadow
27
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28
Lunar Eclipse Time-Lapse
Note the curved shadow of the Earth across the
moon.
29
Predicting Eclipses
  • Eclipse seasons
  • About twice a year
  • Always at least (2) eclipses
  • One of each (lunar solar)
  • About 2 weeks apart
  • Pattern repeats about 18 years for location and
    type

30
Eclipse Seasons
31
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