8th grade-Ch. 1 Sec. 1 Earth in Space

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8th grade-Ch. 1 Sec. 1 Earth in Space

  1. 1. Ch. 1 Sec. 1 Earth in Space
  2. 2. astronomy <ul><ul><li>study of moon, stars & other objects in space </li></ul></ul>
  3. 3. rotation Earth spins on its axis 24 hours causes day & night imaginary line that passes thru Earth’s ctr. & N. & S. Poles
  4. 6. revolution <ul><ul><li>movement of 1 object around another </li></ul></ul>
  5. 7. orbit <ul><ul><li>Earth’s path as it revolves around Sun </li></ul></ul><ul><ul><li>not round-ellipse (oval) </li></ul></ul>
  6. 8. Earth rotates as it revolves. Sun Earth
  7. 9. calendar <ul><ul><li>system of organizing time that defines beginning, length & divisions of a year </li></ul></ul>
  8. 10. leap year <ul><ul><li>1 year = 365 ¼ days </li></ul></ul><ul><ul><li>¼ + ¼ + ¼ + ¼ = 1 day </li></ul></ul><ul><ul><ul><ul><li>leap year every 4 years </li></ul></ul></ul></ul>
  9. 12. 1. tilt of Earth’s axis 2. Earth’s revolution around sun
  10. 13. When the Northern Hemisphere is having summer, Earth is actually at its greatest distance from the sun.
  11. 14. Near the equator, sunlight strikes Earth’s surface more directly and is less spread out than near the poles.
  12. 16. Earth has seasons because it is tilted as it revolves around the sun.
  13. 18. Seasons in the Northern Hemisphere vernal equinox March 21- noon sun directly over equator autumnal equinox Sept. 23- noon sun directly over equator winter solstice Dec. 21- shortest day of year- noon sun 23.5 O N summer solstice June 21- longest day of year- noon sun 23.5 O S
  14. 19. equinox solstice Equinox means &quot;Equal Night&quot;
  15. 21. 1. What causes the Earth's seasons? 2. During which season do the Sun's rays hit the Earth at the most direct angle? 3. During which season are the days the shortest? 4. What is the name and date of the shortest day of the year (and the beginning of winter)? 5. What is the name and date of the longest day of the year (and the beginning of summer)? 6. What is the name of a day in which the day and night are of equal duration? 7. How many times each year do we have days in which the day and night are of equal duration ? Earth’s seasons quiz

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