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15 terms

DES Unit 1: Sun, Earth, Moon Relationships

STUDY
PLAY
Moon Phases
The changing appearances of the Moon as seen from Earth
Crescent Moon
the moon phase in which we see less than half of the moon's sunlit side
First Quarter Moon
when the right half of the sunlit side of the moon is visible
Third Quarter Moon
when the left half of the sunlit side of the moon is visible
Lunar Eclipse
the blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon
Solar Eclipse
occurs when the Moon passes directly between the Sun and Earth and casts a shadow over part of Earth
Rotation
spinning of Earth on its imaginary axis, which currently takes about 24 hours to complete and causes day and night to occur
Revolution
the movement of an object around another object such as the Earth orbiting around the Sun.
Apogee
farthest point from the earth in the orbit of a celestial body such as the Moon
Perigee
closest point from the earth in the orbit of a celestial body such as the Moon
Geocentric Model
A representation of the universe in which stars and planets revolve around Earth. Ptolemy proposed the model.
Heliocentric Model
A representation of the relationship between the Sun and planets in which the planets revolve around the Sun. Copernicus proposed the model.
Retrograde Motion
Apparent backwards motion of the planets in Earth's sky
Umbra
The darkest part of the shadow cast by the Moon on the Earth or the Earth on the Moon
Penumbra
The light outer portion of the shadow cast by the Moon on the Earth or the Earth on the Moon