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Moon Phases

TermDefinition
Lunar Cycle the moons repeated pattern of movement and changes in appearance due to its position relative to the Earth and Sun
Moon Phase the different shapes that the Moon seems to have as seen from Earth caused by the Moon's orbit around the Earth
Waxing growing or getting larger
Waning weakening or growing smaller
Crescent Moon shape of the Moon that is less than the quarter moon; 1% - 49% illuminated
Gibbous Moon shape of the Moon that is greater than the quarter moon, but not a full; 51%-99% illuminated
Full Moon entire disk appears illuminated- 100% visible
First Quarter Moon half of the disk (50%) is illuminated, and the cycle is in the waxing phase
Third Quarter Moon half of the disk (50%) is illuminated, and the cycle is in the waning phase
New Moon the phase when the moon is between the Sun and Earth, and none of the illuminated portion is seen from Earth; 0% visible
Ocean Tide daily changes in the level of ocean water
Gravitational Pull the attraction between two objects due to the invisible force of gravity or the gravitational pull from the Moon that is primarily responsible for the tides that form on the Earth
High Tide when the tide is at its greatest elevation
Low Tide when the tide is at its lowest elevation
Spring Tide tides with the largest daily tidal range, which occur when the Earth, Moon, and Sun line up with each other
Neap Tide tides with the smallest daily tidal range which occur when the Earth, Moon, and Sun form a 90 degree angle
Tidal Effect the force of gravity is not uniform across an object; it is stronger on the side closer to the attracting object and weaker on the side farther from the attracting objects; causes the tides
Created by: Mrs_Bullock
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