These animations shows how Sun’s shadow effect on earth for deferent seasons. Or you can select the Sun’s position and see how the shadow will look like.
Real time physics simulation showing how Sun's shadow various with seasons.
This animation shows how Sun's shadow various with seasons, depending which way the earth is tilted at the time.
Sun's shadow In this first animation, simply drag the Sun using mouse pointer, you can see how shadow varies with the moving mouse. You can select the auto revolving mode to move sun automatically.
Second animation shows how Sun's shadow changes with the months, for simplicity we are showing moving sun relative to Earth, but in actual case Earth revolves around sun.
Interpreting Seismic Monitor's Day/Night Shadow As the earth revolves around the sun, the angle the earth presents to the sun changes, giving each hemisphere longer or shorter days, depending which way the earth is tilted at the time, and helping to cause the seasons. To help envision the day/night lines at various times of the year, here are four animations, one for each Season. Each is an animation of one day only. The yellow and red orb which moves across the world is showing the Sun's position at that time of day. Notice how the shape of the day/night line changes between summer and winter.
March 15th June 15th September 15th December 15th
Source: National Oceanic and Atmospheric administration, NASA
Simulations 
