the action of rotating around an axis or center.

the curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.

A Geocentric theory is an astronomical theory which describes the universe as a Geocentric system, i.e., a system which puts the Earth in the center of the universe, and describes other objects from the point of view of the Earth.

he theory that the earth revolves around the sun is called the heliocentric theory

the branch of science that deals with celestial objects, space, and the physical universe as a whole.

the collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.

an optical instrument designed to make distant objects appear nearer, containing an arrangement of lenses, or of curved mirrors and lenses, by which rays of light are collected and focused and the resulting image magnified.

a celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun.

he force that attracts a body toward the center of the earth, or toward any other physical body having mass. For most purposes Newton's laws of gravity apply, with minor modifications to take the general theory of relativity into account.

the branch of science that deals with celestial objects, space, and the physical universe as a whole

The National Aeronautics and Space Administration (NASA) is the agency of the United States Federal Government responsible for the civilian space program as well as aeronautics and aerospace research.

an imaginary line about which a body rotates.

move or cause to move into a sloping position

a small body of matter from outer space that enters the earth's atmosphere, becoming incandescent as a result of friction and appearing as a streak of light.

a group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure. Modern astronomers divide the sky into eighty-eight constellations with defined boundaries.

the equinox in spring, on about March 20 in the northern hemisphere and September 22 in the southern hemisphere.

the equinox in autumn, on about September 22 in the northern hemisphere and March 20 in the southern hemisphere.

he solstice that marks the onset of summer, at the time of the longest day, about June 21 in the northern hemisphere and December 22 in the southern hemisphere.

the solstice that marks the onset of winter, at the time of the shortest day, about December 22 in the northern hemisphere and June 21 in the southern hemisphere.

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Sun-Earth-Moon

Term	Definition
Rotation	the action of rotating around an axis or center.
revoulution	an instance of revolving
orbit	the curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.
Geocentric theory	A Geocentric theory is an astronomical theory which describes the universe as a Geocentric system, i.e., a system which puts the Earth in the center of the universe, and describes other objects from the point of view of the Earth.
heliocentric theory	he theory that the earth revolves around the sun is called the heliocentric theory
astronomy	the branch of science that deals with celestial objects, space, and the physical universe as a whole.
solar system	the collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.
telescope	an optical instrument designed to make distant objects appear nearer, containing an arrangement of lenses, or of curved mirrors and lenses, by which rays of light are collected and focused and the resulting image magnified.
comet	a celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun.
gravity	he force that attracts a body toward the center of the earth, or toward any other physical body having mass. For most purposes Newton's laws of gravity apply, with minor modifications to take the general theory of relativity into account.
astronomer	the branch of science that deals with celestial objects, space, and the physical universe as a whole
NASA	The National Aeronautics and Space Administration (NASA) is the agency of the United States Federal Government responsible for the civilian space program as well as aeronautics and aerospace research.
axis	an imaginary line about which a body rotates.
tilt	move or cause to move into a sloping position
meteors	a small body of matter from outer space that enters the earth's atmosphere, becoming incandescent as a result of friction and appearing as a streak of light.
constellation	a group of stars forming a recognizable pattern that is traditionally named after its apparent form or identified with a mythological figure. Modern astronomers divide the sky into eighty-eight constellations with defined boundaries.
Vernal equinox	the equinox in spring, on about March 20 in the northern hemisphere and September 22 in the southern hemisphere.
autumnal equinox	the equinox in autumn, on about September 22 in the northern hemisphere and March 20 in the southern hemisphere.
summer solstice	he solstice that marks the onset of summer, at the time of the longest day, about June 21 in the northern hemisphere and December 22 in the southern hemisphere.
winter solstice	the solstice that marks the onset of winter, at the time of the shortest day, about December 22 in the northern hemisphere and June 21 in the southern hemisphere.

Created by: 1962737964

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