SEASON OF THE YEAR AND DAY LENGTH IS DETERMINED BY 
THE POSITION OF THE EARTH RELATIVE TO THE SUN 
  • As the earth revolves around the sun, its axis points to the same location in space.
  • At the summer solstice the axis is tilted 23 1/2 degrees towards the sun.
    • This causes long days and short nights.
  • At the winter solstice the axis is tilted 23 1/2 degrees away from the sun.
    • This causes short days and long nights.
  • At the autumnal and vernal equinox, the axis is not pointed towards or away from the sun.
    (I call it obliquely parallel, or cock-eyed parallel)
    • This causes equal days and nights.