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24 Cards in this Set
- Front
- Back
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Astronomy
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The study of the moon, stars, and other objects in space
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Axis
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An imaginary line that passes through Earth's center and the North and South poles
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Rotation
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The spinning motion of a planet about its axis
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Revolution
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The movement of an object around another object
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Day
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The 24 hours it takes Earth to rotate once on its axis
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Year
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When Earth makes one complete revolution around the sun
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Orbit
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Earth's path as it revolves around the sun
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Latitude
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Measurement of distance from the equator expressed in degrees north or south.
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Solstice
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On two days each year, the noon sun is overhead at either 23.5 degrees south or 23.5 degrees north - December 21 and June 21
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Equinox
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Two days a year when the sun is directly over the equator
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Vernal Equinox
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In the Northern Hemisphere when the sun is directly over the equator - March 21
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Autumnal Equinox
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In the Northern Hemisphere when the sun is directly over the equator - September 23
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Hemisphere
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?
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Season
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Earth's axis is tilted as it moves around the sun and this causes tempatures to change which makes the different seasons
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Phases
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The different shapes of the moon you see from Earth are called phases - the phases are caused by the changes in position of the moon, earth and sun
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Eclipse
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When an object in space comes between the sun and a third object and casts a shadow on that object
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Solar Eclipse
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When the moon passes between Earth and the Sun blocking the sunlight from reaching Earth
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Lunar Eclipse
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Occurs at a full moon when Earth is directly between the moon and the sun
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Umbra
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The darkest part of the moon's shadow
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Penumbra
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The larger and less dark part of the moon's shadow -
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Waxing
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To show an increasing illuminated area
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Waning
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To show a decreasing illuminated area
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Gibbous
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More than half but less than fully illuminated
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Crescent
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Curved like the inner surface of a sphere
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