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Course 3 Topic 9
Lesson 3: Phases and Eclipses
Term | Definition |
---|---|
Phases | The different shapes of the moon. |
New moon | When the moon is between Earth and the sun. |
Waxing crescent | Moon is getting bigger, more light. |
First quarter | When the moon is half lit and half dark, we only see the right half. |
Waxing gibbous | We see about 3/4 of the moon. The right sdie is lit. Moon is getting bigger, more light. |
Full moon | When we see the full sunlit side of the moon. |
Waning gibbous | We see about 3/4 of the moon. The left side is lit. Moon is getting smaller, less light. |
Last/Third quarter | Sun is shining on the opposite side of the first quarter moon. Left half is lit. |
Waning crescent | We only see a small crescent moon; most of the lit part is facing away from Earth. Getting smaller, less light. |
Eclipse | The partial or total blocking of one object in space by another. |
Umbra | The darkest part of a shadow. |
Penumbra | The part of a shadow surrounding the darkest part. |
Tide | The periodic rise and fall of the level of water in the ocean. |
Spring tide | The tide with the GREATEST difference between consecutive low and high tides. |
Neap tide | The tide with the LEAST difference between consecutive low and high tides. |
rotate | The spinning motion of a planet on its axis. |
revolve | The movement of an object around another object. |