Earth Science Astronomy Chapter 1 Earth, Moon,& Sun

25 terms by jvaught

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the study of the moon, stars and other objects in space.


the center around which something rotates


the spinning of the Earth on its axis


the movement of one object around another.


the path of an object as it revolves around another object in space


a system of organizing time that defines the beginning, length, and divisions of a year.


when the sun is farthest north or south of the equator


period of equal days and nights; the beginning of spring and autumn; Ex. vernal/autumnal equinox


a push or pull


the force that attracts all objects toward each other

law of universal gravitation

every object ibn the universe attracts every other object


the amount of matter in an object


the force of gravity on an object


the tendency of an object to resist a change in motion

Newton's first law of motion

the scientific law that states that an object at rest will stay at rest and an object in motion will stay in motion with a constant speed and direction unless acted on by a force


the different shapes of the moon you see from Earth


When an objet in space moves between the sun and a third object, it casts a shadow on the third object.


darkest part of the moon's shadow


partial shadow (in an eclipse)


the rise and fall of the ocean water that occurs every 12.5 hours or so.

spring tide

a tide with the greatest difference between low and high tides

neap tide

the tide with the least difference between consecutive low and high tides


large round pits in the moon's surface


chunks of rock or dust from space


dark, flat regions on the moon's surface also > the Latin word for "seas"

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