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Lunar Cycle

8.7B

TermDefinition
Lunar cycle As the moon orbits the earth, its appearance (the "phase") changes and thus gives us an indication of the moon's progress
Waning shrinking; refers to the sunlit part of the moon we can see from Earth getting smaller.
Waxing literally means growing; sunlit part of the moon we can see from Earth is getting larger
Waxing to increase in light (illumination) Remember “born-right side”
Waning to decrease in light (illumination) Remember “dying- left side”
Crescent less than ½ of the moon is illuminated
Gibbous more than ½ of the moon is illuminated
New-Moon is completely dark and not illuminated
Full-Moon is completely illuminated and has no darkness
Revolution Direction counter clockwise
Length of Cycle about a month (29.5 days) this is because the Moon must be aligned with the Earth and Sun again.
Illumination sunlight reflected off the Moon (the Moon is ALWAYS ½ illuminated, BUT it depends on how much of that ½ we can see from Earth!)
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