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Earth in Space

Earth in Space. What causes day and night?. ROTATION : Earth spinning on its axis is called its rotation and it causes day and night. It takes 24 hours or 1 day for Earth to rotate once on its axis. Day and Night.

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Earth in Space

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  1. Earth in Space

  2. What causes day and night? • ROTATION: Earth spinning on its axis is called its rotation and it causes day and night. • It takes 24 hours or 1 day for Earth to rotate once on its axis.

  3. Day and Night • The Earth continuously rotates to the east which is why the sun appears to set in the west. • It is nighttime on the side where the Earth is not facing the Sun; daytime where the Earth is facing the Sun.

  4. What causes years? • REVOLUTION: Earth traveling around (orbiting) the Sun is called revolution. • It takes 365.25 days for Earth to revolve once around the Sun.

  5. What causes Seasons? • Two things cause Earth to have seasons • Revolution of Earth around the Sun • The TILT of Earth’s axis as it revolves around the Sun. • Earth is tilted 23.5° on its axis.

  6. What causes Seasons? • When the North Pole is tilted TOWARDS the Sun the Northern Hemisphere is experiencing Summer. • When the North Pole is tilted AWAY from the Sun the Northern Hemisphere is experiencing Winter.

  7. Solstices • Summer Solstice – June 21 or 22 • 1st Day of Summer • Longest “Day” of the year • The most hours of daytime • The sun is directly over the Tropic of Cancer. • Winter Solstice – December 21 or 22 • 1st Day of Winter • Longest “Night” of the year • The most hours of nighttime • The sun is directly over the Tropic of Capricorn.

  8. Equinox • Spring Equinox – March 20 or 21 • 1st Day of Spring • EQUAL amount of daytime and nighttime • The sun is directly over the Equator. • Fall Equinox – September 22 or 23 • 1st Day of Fall • EQUAL amount of daytime and nighttime • The sun is directly over the Equator.

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