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Lecture 1

Astronomy 1021 Lecture Notes - Lecture 1: Lunar Phase, Full Moon


Department
Astronomy
Course Code
ASTR 1021
Professor
Robert Cockcroft
Lecture
1

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Sunday, October 2, 2016
Mastering Astronomy Quiz #1 Notes
Astronomy
-As the Earth orbits the Sun, the moon orbits around the Earth, completing one loop
roughly every four weeks
-What fraction of the moon is always lit by the Sun? At any point in its orbit, half of the
moon is illuminated by the sun (just as half of the earth is always illuminated by the
sun).
-The same side of the moon always faces the earth. The illuminated portion of the
moon however, does not always face the earth. Why is this?
-Because the Moon makes exactly one rotation around its own axis during each
of its orbital revolutions around the earth.
-The orbital position of the Moon determines both the lunar phase and the time of day
th which the moon rises and sets.
-Full moon always rises at dusk
-First quarter Moon will rise at noon
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