Chapter 12 Sections 1,3 Flashcards
Astronomy
The study of the moon, stars, and other objects in space
Axis
An imaginary line that passes through Earth’s center and the North and South poles, about which the Earth rotates
Rotation
The spinning motion of a planet on its axis.
Revolution
The movement of an object around another object
Orbit
The path of an object as it revolves around another object
Calendar
A system of organizing time that defines the beginning, length, and divisions of a year
Solstice
The two days of the year on which the sun reaches its greatest distance north or south of the equator
Equinox
The two days of the year on which neither hemisphere is tilted toward or away from the sun
Phase
One of the different apparent shapes of the moon as seen from Earth
Eclipse
The partial or total blocking of one object in space by another
Solar eclipse
The blocking of sunlight to earth that occurs when the moon is directly between the sun and earth
Umbra
The darkest part of a shadow
Penumbra
The larger, less dark part of a shadow surrounding the darkest part.
Lunar eclipse
The blocking of sunlight to the moon that occurs when earth is directly between the sun and the moon
Tide
The periodic rise and fall of the level of water in the ocean
