Different Seasonal Phenomena

• Oblate spheroid

  The accurate description of the shape of the Earth

  
• Earth's Rotation


  • Direction of Motion: Rotates on its axis on a counterclockwise manner
  • Period of Motion: 1 rotation = 24 hours or 1 day
  • Effect: daytime and nighttime
• Earth's Axis


  • An imaginary line passing through the northern and southern poles
  • The Earth rotates on its axis and is tilted at an angle of 23.5°
• Earth's Revolution


  • Direction of Motion: counterclockwise around the sun
  • Period of Motion: 1 revolution = 365 ¼ days or 1 year
  • Effect: changing seasons and the equinoxes and solstices
• The Earth's tilt and rotation causes daytime and nighttime
• Direct Rays


  Rays that hit the Earth at 90 degrees
• Indirect Rays


  Rays that hit the Earth at less than 90 degrees
• Areas of the Earth that are hit by direct rays are warmer than areas that are hit by indirect rays
• Season


  One of the four natural divisions or periods of the year
• The uneven length of daytime and nighttime
• Summer Solstice


  Longest day of the year, occurs on June 21 or 22
• Winter Solstice


  Shortest day of the year, occurs on December 21 or 22
• In June, the northern hemisphere is tilted towards the Sun, experiencing Summer season
• In December, the northern hemisphere is tilted away from the Sun, experiencing Winter season
• Vernal (Spring) Equinox


  Occurs on March 20 or 21, the North Pole begins its six months of daylight
• Autumnal (Fall) Equinox


  Occurs on September 21 or 22, the North Pole begins six months of nighttime
• Factors that Determine Seasons on Earth

  • Oblate Spheroid Shape
  • Tilting of the Earth
  • Earth's Revolution around the Sun
• The Philippine Climate is a tropical climate, it experiences two seasons: the dry season and wet season
• The solstices and equinoxes describe the amount of sunlight received by a certain place