TERM 1
tides
DEFINITION 1
periodic raising and lowering of sea level that occurs daily
throughout the ocean
TERM 2
barycenter
DEFINITION 2
balance point of a system
TERM 3
zenith
DEFINITION 3
the point on the celestial sphere directly over the observer;
point closest to Moon
TERM 4
nadir
DEFINITION 4
the point on the celestial sphere directly opposite the zenith
and directly beneath the observer (farthest from moon)
TERM 5
centripetal force
DEFINITION 5
center-seeking force that tends to make rotating bodies
move toward the center of rotation; provided by gravitational
attraction between each planet and the Sun
