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