Day, Night and Seasons

Day, Night and Seasons

1. The 4 seasons

   • Summer
   • Winter
   • Autumn
   • Spring

2. The Sun

   • Because the earth is moving, the sun appears to travel from east to west every day
     • This is because the earth is rotating to the east
   • In the summer it is high
   • In the winter it is low

3. The seasonal tilt

   • The Northern Hemisphere
     • When the northern part of the earth is tilted it is summer in the northern hemisphere
     • When the souther part of the earth is tilted it is winter in the northern hemisphere
   • The Southern hemisphere
     • When the northern part of the earth is tilted it is winter in the southern hemisphere
     • When the southern part of the earth is tilted it is summer in the southern hemisphere

4. Years

   • A planet's year is the time it takes to make one complete orbit around the Sun
   • The Earth goes once round the Sun in one Earth year.
     • Thats 365 earth days
   • Different planets take different lengths of time to orbit the Sun
     • Mercury has a year of just 88 Earth days
     • Neptune has a year of 164 Earth years

5. Day and Night

   • A day is the amount of time it takes a planet to complete a full rotation
     • An earth day is 24 hours long
   • The Sun lights up one half of the Earth, and the other half is in shadow
     • The half in shadow is experiencing night and the half in light day