30Tropic of Cancer: an imaginary line that is located 23 ½ degrees north of the Equator
31Tropic of Capricorn: an imaginary line that is located 23 ½ degrees south of the Equator
32**the Sun will only get directly overhead (Zenith) between the Tropics **the equator always gets 12 hours of daylight!!!
33Four Important Days in Earth Science: Summer Solstice:June 21stNorthern hemisphere is tilted towards the SunInsolation (incoming solar radiation) is most direct (sun highest in the sky)Longest Day of the year in the Northern HemisphereSun is directly above The Tropic of Cancer at noonSun rises north of east and sets north of west
37Winter Solstice: December 21st Northern Hemisphere is tilted away from the SunInsolation is least direct (sun lowest in the sky)Shortest day of the year in the Northern HemisphereSun is directly above The Tropic of Capricorn at noonSun rises south of east and sets south of west
42WinterSpringSummerFallDate of First DayScientific NameDirect Rays of the Sun HitWhat is Happening Inside the Arctic Circle?What is Happening Inside the Antarctic Circle?How much daylight do we get on First Day in NYS?How many degrees is the Earth Tilted?Altitude of noon sun in NYS
43Seasons ReviewThe tilt (or “inclination”) is the reason for the seasonsTemperature changes because the Sun’s rays strike the earth at different angles (high altitude = high temp.)Insolation = SunlightOn the equinoxes, the Sun is directly over that equator at noonOn the summer solstice, the Sun is directly overhead The Tropic of Cancer at noonOn the winter solstice, the Sun is directly overhead The Tropic of Capricorn at noonThe Lower the Sun is in the sky, the longer the shadowThe equator always has 12 hours of daylight
44**Remember****The Sun ONLY gets 90° (directly overhead in the tropics (23 ½º N and 23 ½º S)**