imaginary vertical line around which Earth spins
the spinning of Earth around its axis that causes day and night
Earth's yearly orbit around the Sun
elongaged, closed curve in which the Earth orbits
the two days when the Sun reaches its greatest distance north or south of the equator
June 21 or 22 when the Sun is closest to Earth
December 21 or 22 when the Sun is farthest from Earth
each of the two days in a year on which day and night are equal in length; marks the beginning of spring and autumn.
different forms that the moon takes in its appearance from earth
Moon phase that occurs when the Moon is between Earth and the Sun, at which point the Moon cannot be seen
Describes phases following a new moon, as more of the Moon's lighted side becomes visible.
Describes phases that occur after a full moon, as the visible lighted side of the Moon grows smaller.
occurs when the Moon passes directly between the Sun and Earth and casts a shadow over part of Earth
occurs when Earth's shadow falls on the Moon
dark-colored, relatively flat regions of the Moon formed when ancient lava reached the surface and filled craters on the moon's surface
craters or depressions left by objects striking the Moon