VIEWS: 1 PAGES: 18 POSTED ON: 12/19/2012
Motions of the Solar System Earth’s Motions Earth has Three Motions 1. Daily 2. Yearly 3. Cyclic Earth’s Motions Rotation Causes Day and Night Two types of Day Sidereal • Time it takes for the Earth to make one Complete rotation • 23 hrs and 56 minutes Solar • Time it takes to go from one Noon to the Next • 24 hours Earth has a tilt of 23.5 Degrees One cause of the seasons How Fast are We Moving? Earth’s Motions Revolution Earth’s Yearly Journey around the Sun 365 days One Cause of the Seasons Changes the Amount of solar radiation reaching the earth Aphelion Furthest point away from the sun Perihelion Closest point to the sun Annual Motion of the Earth Earth’s Annual Motion around the Sun is an ellipse Ellipse An Elongated Closed Circle Sun is not at Center Earth’s Motions Precession The Cause of the Seasons Sun Position Relative to Earth Degrees in Event Date Season Latitude Vernal Equinox 0 or Equator March 21st Spring 23.50 N or Summer Solstice June 21st Summer Tropic of Cancer Autumnal 0 or Equator September 21st Fall Equinox 23.50 S or Tropic Winter Solstice December 21st Winter of Capricorn No Tilt, No Seasons Height of Sun in Sky Angle of Insolation Angle of Insolation Length of Day and Latitude Latitude and Amt. of Solar Radiation
"Motions of the Solar System.ppt"