Earth and Sun: What Causes Day and Night?
sunrise
A time in the morning when the sun appears over the horizon. The sun always rises in the east.
equator
An imaginary circle around the middle of the earth, halfway between the North Pole and the South Pole
axis
An imaginary line that passes through Earth's center and the North and South poles
revolution
The movement of an object around another object
rotation
Turning around an axis
sunset
a time in the evening when the Sun disappears under the horizon. The Sun always sets in the west.
compass
an instrument for determining directions, as by means of a freely rotating magnetized needle that indicates magnetic north.
1 year
how long it takes Earth to make 1 revolution around the Sun
24 hours
how long it takes Earth to rotate on its axis
shadow
the dark area behind an object that blocks light
Sun
the star at the center of the solar system around which all of the other solar system objects orbit
day
the time between sunrise and sunset on Earth
night
the time between sunset and sunrise on Earth
orbit
to move or travel around an object in a curved path
