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angelfire/sc2/frankt/start_and_end_malaria.htm

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  1. Malaria Season beginning end http://www.angelfire.com/sc2/frankt/start_and_end_malaria.htm

  2. South Carolina Seasonality http://www.dnr.state.sc.us

  3. http://hurricanes.noaa.gov/prepare/season.htm

  4. Seasonality is caused by the tilt of the Earth relative to its orbital plane around the Sun. This causes both: • The strength of sunlight reaching the surface, and • The length of the day • to vary on a regular, yearly cycle. • Observations we expect to make: • Temperature is positively correlated with the strength of sunlight reaching the surface. • Temperature is positively correlated with day length http://www.doc.mmu.ac.uk/aric/eae/english.html

  5. http://www.u.arizona.edu/~korine/230/chap2_figs.htm

  6. Radiation illuminated side day Sun dark side night NOT TO SCALE!

  7. Radiation N Sun axis of rotation equator S NOT TO SCALE!

  8. Radiation Solar radiation shining more directly on Southern Hemisphere North - Winter Sun South - Summer NOT TO SCALE!

  9. Radiation Solar radiation shining more directly on Northern Hemisphere North - Summer South - Winter NOT TO SCALE! http://www.secussa.nafsa.org/

  10. South: fall North: spring South: winter North: summer South: summer North: winter South: spring North: fall http://www.boechat.com/tele/base/2001_11.html http://www.bbc.co.uk/science/space/solarsystem/earth/solsticescience.shtml

  11. Equinox – Two specific points in the Earth’s orbit when each hemisphere gets 12 hours of sunlight. Spring equinox in the Northern Hemisphere is Fall Equinox in the Southern Hemisphere. Solstice – Two specific points in the Earth’s orbit when the amount of day length in one hemisphere has reached a maximum, and in the other has reached a minimum. Winter solstice in the Northern Hemisphere is Summer solstice in the Southern Hemisphere. Equinox dates – September 22, March 22 Solstice dates – December 22, June 21

  12. Equinox – Two specific points in the Earth’s orbit when each hemisphere gets 12 hours of sunlight. North Pole on March 22 South Pole on March 22 Twice a year (September 22nd, March 22nd) every latitude on Earth gets exactly 12 hours of sunlight. http://milhouse.jpl.nasa.gov/

  13. Solstice – Two specific points in the Earth’s orbit when the day length in one hemisphere has reached a maximum and in the other has reached a minimum. North Pole June 21 South Pole on June 21 On the longest day of the year in the Northern Hemisphere (June 21st), the Sun never sets on any latitude above the Arctic circle (blue) and latitudes below the Antarctic circle (red) get no sunlight at all. http://milhouse.jpl.nasa.gov/

  14. Subsolar latitude – the latitude at which the Sun appears directly overhead at noon on that day. June 21st http://www.u.arizona.edu/~korine/230/chap2_figs.htm

  15. September 22nd Sun directly overhead at the equator At midday, the Sun appears 35o down from vertical to an observer in Rock Hill, or: 35o 55o 35o 90o - 35o = 55o Polaris appears <your latitude> above your horizon 55o above the horizon. Rock Hill Latitude= 35oN Polaris appears 35oabove horizon to observers in Rock Hill Rock Hill Latitude= 35oN

  16. June 21st Sun directly overhead at 23.5o N At midday, the Sun appears: 180o-145o-23.5o = 11.5o 11.5o down from vertical to an observer in Rock Hill, or: 78.5o 35o 145o 11.5o 23.5o 90o - 11.5o = 78.5o Polaris appears <your latitude> above your horizon 78.5o above the horizon. Rock Hill Latitude= 35oN Polaris appears 35oabove horizon to observers in Rock Hill Rock Hill Latitude= 35oN

  17. December 22st Sun directly overhead at 23.5o S At midday, the Sun appears: 58.5o 35o + 23.5o = 58.5o 31.5o down from vertical to an observer in Rock Hill, or: 35o 23.5o 90o - 58.5o = 31.5o Polaris appears <your latitude> above your horizon 31.5o above the horizon. Rock Hill Latitude= 35oN Polaris appears 35oabove horizon to observers in Rock Hill Rock Hill Latitude= 35oN

  18. 90o 80o June 21st 70o 60o September 22nd Midday Sun Angle 50o 40o December 22nd 30o 20o 10o 78.5o 55.0o 31.5o 0o