Earth, Sun, and Moon

moon phases

the shape of the illuminated (sunlit) portion of the Moon as seen by an observer on Earth.

revolution

the movement of one object around a center or another object

orbit

the curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution.

axis

an imaginary line about which a body rotates.

tilt

to cause to lean, incline, slope, or slant.

indirect sunlight

light rays that hit the Earth at an angle

direct sunlight

rays of light that strike the Earth at a perpendicular or 90 degree angle

hemisphere

The Earth spins at a slight angle or t___ on its orbital path. (tilt, turn)
a half of the earth, usually as divided into northern and southern halves by the equator, or into western and eastern halves by an imaginary line passing through the poles.

rotation

The spinning motion of a planet on its axis

waxing

the illuminated surface of the Moon as seen from Earth is increasing in size, right side is illuminated

gibbous

moon phase during which more than half of the side facing the Earth is illuminated.

crescent

Moon phase in which less than half of the Moon appears to be illuminated.

waning

(of the moon) pertaining to the period during which the visible surface of the moon decreases, left side is illuminated

Lunar Cycle

The revolution of the Moon around Earth that produces the changing phases of the Moon. One complete lunar cycle takes about 29.5 days.

Seasons are caused by

the tilt of the earth's axis & the revolution around the sun