Studied by 193 peoplehorizon
the line at which the earth's surface and the sky appear to meet
navigate
plan and direct the route or course of a ship, aircraft, or other form of transportation, especially by using instruments or maps
sphere
a round solid figure
equator
an imaginary line dividing the earth into northern and southern hemispheres
gravity
the force that attracts a body toward the center of the earth
axis
an imaginary line around which an object rotates
rotation
the circular movement of an object around a central axis
revolution
the movement of an object around another
altitude
the apparent height of an object above the horizon
constellation
a group of stars in the sky, usually named after some object, animal, or mythological being
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