The spinning motion of Earth around its own axis, which runs from the North Pole to the South Pole, completing one full spin in approximately 24 hours.

The 24-hour time period caused by Earth's rotation, determining the cycle of daylight and darkness.

The orbital movement of Earth around the Sun, tracing an elliptical path over the course of one year.

The time it takes for Earth to complete one full revolution around the Sun, roughly 365.25 days.

The four divisions of the year (spring, summer, fall, winter) caused by the tilt of Earth's axis (23.5°) combined with its revolution around the Sun, resulting in changing amounts of sunlight.

: Occurs twice a year (around March 20/21 and September 22/23) when Earth's axis is tilted neither toward nor away from the Sun, causing day and night to be nearly equal in length everywhere on Earth.

Occurs twice a year (around June 21/22 and December 21/22) when the Earth's tilt toward or away from the Sun is at its maximum.

an artificial body placed in orbit around the earth or moon or another planet in order to collect information or for communication

the force that attracts a body toward the center of the earth, or toward any other physical body having mass.

Lunar phases are the different shapes of the Moon as seen from Earth, caused by the changing angles of the Earth, Moon, and Sun as the Moon orbits the Earth.

an obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of illumination.

the fully shaded inner region of a shadow cast by an opaque object, especially the area on the earth or moon experiencing the total phase of an eclipse.

the partially shaded outer region of the shadow cast by an opaque object

the alternate rising and falling of the sea, usually twice in each lunar day at a particular place, due to the attraction of the moon and sun.

The vertical difference between the high tide and the low tide

A spring tide is a high-amplitude tide occurring when the Earth, Sun, and Moon align (syzygy) during new or full moons.

a tide just after the first or third quarters of the moon when there is least difference between high and low water

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Vocabulary - Unit 4:

Term	Definition
Rotation:	The spinning motion of Earth around its own axis, which runs from the North Pole to the South Pole, completing one full spin in approximately 24 hours.
Day	The 24-hour time period caused by Earth's rotation, determining the cycle of daylight and darkness.
Revolution	The orbital movement of Earth around the Sun, tracing an elliptical path over the course of one year.
year	The time it takes for Earth to complete one full revolution around the Sun, roughly 365.25 days.
season	The four divisions of the year (spring, summer, fall, winter) caused by the tilt of Earth's axis (23.5°) combined with its revolution around the Sun, resulting in changing amounts of sunlight.
equinox	: Occurs twice a year (around March 20/21 and September 22/23) when Earth's axis is tilted neither toward nor away from the Sun, causing day and night to be nearly equal in length everywhere on Earth.
solstice	Occurs twice a year (around June 21/22 and December 21/22) when the Earth's tilt toward or away from the Sun is at its maximum.
satellite	an artificial body placed in orbit around the earth or moon or another planet in order to collect information or for communication
gravity	the force that attracts a body toward the center of the earth, or toward any other physical body having mass.
lunar phases	Lunar phases are the different shapes of the Moon as seen from Earth, caused by the changing angles of the Earth, Moon, and Sun as the Moon orbits the Earth.
eclipse	an obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of illumination.
umbra	the fully shaded inner region of a shadow cast by an opaque object, especially the area on the earth or moon experiencing the total phase of an eclipse.
penumbra	the partially shaded outer region of the shadow cast by an opaque object
tide	the alternate rising and falling of the sea, usually twice in each lunar day at a particular place, due to the attraction of the moon and sun.
tidal range	The vertical difference between the high tide and the low tide
spring tide	A spring tide is a high-amplitude tide occurring when the Earth, Sun, and Moon align (syzygy) during new or full moons.
neap tide	a tide just after the first or third quarters of the moon when there is least difference between high and low water

Created by: Walter Daniels

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