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# Notes revolution rotation

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• Period of revolution, ellipse, astronomical unit
• astronomical unit (potentially do lab on page 464)
• ### Notes revolution rotation

1. 1. To ASTRONOMY….. and beyond!
2. 2. What we will be discovering:  Structures of the solar system  The Sun-Earth-Moon System  The Planets and their Moons  Asteroids, Comets, and Meteoroids  Stars and Galaxies
3. 3. Axis and Period of Rotation Axis of Rotation Period of Rotation  an imaginary line that  The time it takes for one runs through the center of the planet. (The planet rotates around this line.) rotation around the axis to occur. (one day)
4. 4. Period of Revolution and Ellipse Period of Revolution Ellipse  The time it takes a planet  Oval shaped. (example: to move completely around the sun. (one year) Earth’s orbit around the sun is an oval or ellipse.)  ALL planets have elliptical orbits around the sun (Kepler’s first law)
5. 5. AU’s and LY’s Astronomical Unit Light Year  The average distance  The distance that light from Earth to the Sun.  1 AU = 149,600,000km travels in a vacuum in one Julian year. (365.25 days)  Typically used to measure distances on a galactic scale.  1 ly = apx 10 trillion km
6. 6. Now, because I know you’re interested… Revolution and Rotation periods of the planets: Planet P of rotation P of revolution Mercury 59 days 88 days Venus 243 days 255 days Earth 24 hours 365 days Mars 24 hours 687 days Jupiter 10 hours 11.9 years Saturn 11 hours 29.5 years Uranus 17 hours 84 years Neptune 16 hours 165 years
7. 7. The reason for the seasons!  The yearly cycle of the seasons is caused by the tilt of Earth’s axis as it revolves around the sun.  Depending on which hemisphere is tilted towards the sun, they will be experiencing summer and the one tilted away will be experiencing winter.  The equator always experiences warm weather because it’s always tilted toward the sun!
8. 8. Earth + Revolution = Seasons
9. 9. The Equinoxes  The earth experiences 2 equinoxes- one in March and one in September.  An equinox is when neither end of the Earth’s axis is tilted toward the sun, therefore, both hemispheres are receiving an equal amount of sunlight and energy!  Day and night are equal in length during the actual equinox (March 21 and September 22)
10. 10. The Solstices  The solstices are the times of year when the direct sunlight is farthest north or south of the equator.  The summer solstice occurs for us on June 21 (this is the winter solstice for the southern hemisphere)  The winter solstice occurs for us on December 21 (this is the summer solstice for the southern hemisphere)