AST101H1 Lecture Notes - Lecture 4: Clipse, Dark Moon
22 Sep 2016
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To get back to a space station, an astronaut must push away to get towards it. The north star (polaris) is important because it appears very near the north celestial sphere. The celestial sky will not only change within the hours, but also annually. Phases: half lit by the sun orbiting earth. The far side of the moon is not seen due to the earth and moon"s orbit. Terminator: the light that shines from the earth while the moon is in front. Lunar clipse: when the moon is in front of the sun. Not seen in all places on earth. So umbra shadow is totally dark and penumbra is slightly darker than no shadow. When the moon is reflecting the sun. Totality: dark moon in front of the sun. A new moon on earth means that it is a full earth on the moon.
