Movement
the time needed for Earth to complete one rotation around its axis
Day
Tilt
When the tide is at its lowest level
Low tide
Occurs when the moon passes through Earth's shadow
Lunar eclipse
Gravitational force
Spinning of a planet, moon, sun, or other object around its axis
Rotation
When Earth's rotation axis is neither towards nor away from the sun
Equinox
When the tide is at its highest level
High tide
moon phases from new moon to full moon, as the lit surface seen from Earth grows larger
Waxing
A natural body that orbits another body in space
Natural satellite
Oval shaped path of a celestial body
Elliptical
One of two days in the year when hours of daylight and hours of darkness are at their greatest and least
Solstice
a natural object that revolves around a planet
moon
The curved sickle shape of the waxing or waning moon
Crescent
States that the force of gravity between two objects increases as the mass of the object increases and the distance between them decreases
Law of Universal Gravitation
Axis
Path that an object follows as it revolves around another object
Orbit
Daily rise and fall of the oceans, caused mainly by the gravitational pull of the moon
Tide
Occurs when the moon passes between the Earth and the Sun, blocking the Sun's light from Earth
Solar eclipse
Imaginary line forming a great circle around the Earth's surface, equidistant from the poles
Equator
One orbit of an object in space around another object
Revolution
Period of time in which Earth makes one revolution around the sun
Year
Waning
Having the observable illuminated part greater than a semicircle and less than a circle.
Gibbous
A half of a sphere
Hemisphere