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3.3 Vocabulary (oa)

Vocabulary 3.3 (oa)

TermDefinition
rotation The SPINNING motion of a planet on its axis; The spinning of Earth on its axis causes day and night (24 hrs for a complete rotation).
revolution When an object moves AROUND another object in space.
orbit The PATH an object takes as it moves around another object.
axis An imaginary line through the center of Earth that connects the North Pole to the South Pole.
day The time it takes a planet to complete ONE FULL ROTATION (Earth's is 24 hours).
year The time it takes a planet to complete ONE FULL REVOLUTION around the sun (Earth's is 365.25 days).
Reason for the Seasons Earth's axis is tilted as it revolves around the sun causing the Northern Hemisphere and Southern Hemisphere to receive sunlight at different angels throughout the year.
Summer For us, it is when the Northern Hemisphere is tilted TOWARD the sun causing it to receive Direct Sunlight. Daylight hours are longer than night at this time.
Winter For us, it is when the Northern Hemisphere is tilted AWAY from the SUN causing it to receive sunlight at an angle (spread out). Shorter days and longer nights at this time.
What causes Day and Night? Earth's rotation
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