Chapter 1 Discovering the Night Sky

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Chapter 1Discovering the Night Sky
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These coordinates can be used to describe the
position of stars locally
zenith
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An imaginary ____________________surrounding
Earth aids in navigating the sky
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___________ causes the position of the NCP to
change over a period of ________ years.
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The Earth Rotates!
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Earths ___________________ rotation also causes
the Sun and stars to appear to move from _____ to
_______
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Motion of Stars at the __________
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Motion of Stars at the __________
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What is wrong with this cartoon?
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Birds in the Northern Hemisphere fly South for
the Winter

• That is when it is winter in the Northern
  Hemisphere, it is
• ____________ in the Southern Hemisphere

which means that the Earths revolution around
the Sun can not be the only explanation for
seasons!
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The altitude of the Sun impacts how much energy
is received on Earth resulting in ________.
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The seasons are caused by _______________________
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(No Transcript)
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Although the Moon is always ? lit from the Sun,
we see different amounts of the lit portion from
Earth depending on where the Moon is located in
its month-long orbit.
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Moon Phase Names
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Concept Question
If the moon was between the Earth and the Sun,
what phase do you think it will be? A)
full B) new C) first quarter D) third
quarter
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Concept Question
Three weeks from that phase, what will be
the phase of the moon? A) 1st quarter B)
full C) new D) 3rd quarter
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Eclipses occur only when the Moon crosses the
ecliptic during the new or full phase
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Lunar Eclipses
Darkest part of the shadow
Intermediate part of the shadow
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Lunar Eclipses
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Eclipses occur only when the Moon crosses the
ecliptic during the new or full phase
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Solar Eclipses
Solar eclipses occur when the moon crosses the
orbital plane of the Earth and when it is
between the Earth and the Sun!!!
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Solar Eclipse
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Solar Eclipses
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What Do You Think?

• What is a celestial sphere?
• What causes the seasons?
• What causes the moon to have
• phases?
• What is the difference between
• a lunar and solar eclipse?