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AS LS2 Vocabulary

Astronomy Learning Set 2 Vocabulary

TermDefinition
Sundial a device that measures time using shadows cast by an object that blocks the Sun’s light.
Gnomon the object on a sundial blocking direct light from the SUn and casting a shadow.
Axis a line through the center of a body, around which the body rotates, or spins.
Day the amount of time it takes a body to spin once on its axis.
Reflection Bouncing back of light from a surface.
Phases of the Moon the illuminated part of the Moon visible from Earth at a given time.
Orbit the path that a solar-system object takes in revolving around another solar-system object.
Horizon the line at which the sky and the Earth appear to meet.
Eclipse the blocking of light from one object in space by another object in space, as seen from a particular location.
Solar eclipse when the Moon passes between the Sun and Earth, so that light from the sun is partially or totally blocked.
Lunar eclipse when the Moon passes through Earth’s shadow so that some or all of the Moon can only be seen by reflected light from Earth.
Total eclipse the complete blocking of light from one object in space by another object in space, as seen from a particular location.
Partial eclipse the blocking of a portion of light from one object in space by another object in space, as seen from a particular location.
Umbra the dark, inner shadow cast by an object.
Penumbra the lighter outer shadow cast by an object.
Corona outer portion of the Sun’s atmosphere, consisting of superheated gases, can only be seen during a solar eclipse.
Created by: Marquart
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