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12 Cards in this Set

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The study of all physical abjects beyond earth.
Astronomy
A system of organizing time.
Calendar
The time required for the Earth to orbit around the sun.
Year
Roughly the amount of time required for the moon to orbit around the earth once.
Month
A year in which an extra day is added to the calendar is called.
Leap Year
Mirrors are used to focus light in a.
Reflecting Telescope
Sections of the sky that contain recognizable star patterns.
Constellations
The first scientist to successfully use a telescope to observe the night sky.
Gallieo
Astronomers divide the sky into.
Constellations
The line where the earth and sky meet is called.
Horizon
The best place for an astronomer to observe the sky and take measurements.
Mountain top
One complete rotation of the Earth on its axis is the basis for length of a.
Day