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Apogee
Point in the Moon's orbit when it is furthest from the Earth
Satellite
Any object that moves around another object
Star
Self-illuminated body in space made of glowing hot gases heated by nuclear fusion in its core
Moon
A natural object in space that orbits a planet
Revolution
Movement of an object around some point or other object in space; process of orbiting
Ellipse
Oval -shaped
Orbit
Elliptical path in which an object in space moves around another object in space
Astronomy
Study of the universe outside of Earth and its atmosphere
Planet
Nearly round object in space that dominates its orbit around a star
Rotation
Turning or spinning of an object about an axis
Sun
The closest star to earth and the center of our solar system
Perigee
Point in the Moon's orbit when it is closest to the Earth
Phases of the Moon
The various shapes of the lit portion of the moon seen from earth as it travels in its orbit around earth; the change in the appearance of the moon as seen from earth as it orbits earth
Spring Tides
Tides with a larger difference between successive high and low tides that occur during the full and new moon phases
Waxing
Growing larger, increasing
Lunar Eclipse
Blocking out of the moon by earth that occurs when the earth moves directly between the sun and the moon; the earth casts its shadow on the moon
Neap Tides
Tides with a smaller difference between successive high and low tides that occur during the quarter phases of the moon
Ecliptic
Plane in which the earth's orbit around the sun lays
Waning
Growing smaller, decreasing
Tides
Daily changes in the elevation of the ocean surface
Solar Eclipse
Blocking out of the sun by the moon that occurs when the new moon moves directly between the earth and the sun; the moon casts its shadow on earth
Solstice
The two days throughout the year in which the sun stops getting higher or lower in the sky at midday
Equinox
The two days throughout the year in which the length of day is equal to the length of night everywhere on Earth