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Lecture 5

AST101H1 Lecture Notes - Lecture 5: Ecliptic, Northern Hemisphere, The MoonsPremium


Department
Astronomy & Astrophysics
Course Code
AST101H1
Professor
Michael Reid
Lecture
5

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AST101 – Lecture 5 – The Phases of the Moon
Review
Earth’s tilt always points in the same direction – meaning the tilt only seems to
change because Earth orbits around the Sun, and your (or Earth’s) position to what
side of the Sun you’re (or it is) on changes.
Earth is tipped toward the Sun resulting in the Summer Solstice (Northern
Hemisphere) and when it is tipped away from the Sun resulting in the Winter
Solstice (Northern Hemisphere) *Please refer to Lecture 4 Note, specifically about
‘The Seasons’, for more information
The Moon
The Earth orbits the Sun counter-clockwise as seen from above the Earth’s North
Pole, while rotating counter-clockwise on its axis
The Moon orbits the Earth counter-clockwise as seen from above the Earth’s North
Pole, while rotating counter-clockwise
Note: The Moon’s orbit is not in the ecliptic plane – meaning it’s orbit has a tilt
*The bodies are not to scale
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