Rotation, Revolution, & Seasons

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Presentation transcript:

Rotation, Revolution, & Seasons

Why does Earth have day & night? Because the Earth rotates Rotation is the spin of an object about its axis. The Earth rotates once a day (once every 24 hours).

Why does Earth have seasons? The yearly cycle of the Earth’s seasons is caused by the tilt of Earth’s axis as it revolves around the sun Revolution is the orbit of one object around another. Earth's Orbit and Daylight http://www.mathsisfun.com/earth-orbit.html

Earth’s Seasons in the N. Hemisphere Day in N. Hemisphere Approximate Date each year Length of Daytime Hemisphere that is tilted toward the sun Summer Solstice June 21 Longest Day Northern Autumnal Equinox September 22 Daytime & Night time both 12 hours Neither Winter Solstice December 21 Shortest Day Southern Vernal (Spring) Equinox March 21

Phases, Eclipses, Tides

How long does it take the moon… To rotate once on its axis? It takes 27.3 days To revolve once around the Earth? A day & a year on the moon are the same length Synchronous Rotation of the Moon – YouTube http://www.youtube.com/watch?v=OZIB_leg75Q

Phases of the Moon Phases of the Moon – YouTube http://www.youtube.com/watch?v=AQRNzepe4wI

Waxing vs. Waning “Waxing” refers to the increase of light “Waning” refers to the decrease of light

Solar Eclipse occurs when the Moon passes between the Sun and the Earth, and the Moon fully or partially blocks the Sun (show file - ess05_vid_totaleclipse_450)

Lunar Eclipse A lunar eclipse occurs when the Moon passes behind the Earth so that the Earth blocks the Sun's rays from striking the Moon. This can occur only when the Sun, Earth, and Moon are aligned exactly, or very closely so, with the Earth in the middle. Hence, a lunar eclipse can only occur the night of a full moon. NASA - NASA Releases New Lunar Eclipse Video http://www.nasa.gov/mission_pages/LRO/news/eclipse-video.html

What is the main cause of tides on Earth? Explain why there are two high tides and two low tides. BrainPOP | Science | Learn about Tides