The speed of movement can be calculated from the change in color. If we look at the 'red-nosed reindeer' pulling Santa's sleigh, when the reindeer approaches, the wavelength becomes shorter and ...

REINDEER STABLES, HERSHEY PARK ... the trip and their eyes are clear so they can see where they are pulling Santa's sleigh,” Luley said. “Additionally, we are checking for any signs of ...