“Revolution and rotation are the terms we use to describe the motions of the earth and moon. Revolution is the movement of the earth in an orbit around the sun.  The Earth completes one revolution around the sun every 365 days. The moon revolves around the Earth about once every month.” 

Source: www.nowykurier.com

Understanding the relationships between the Sun, Earth and moon are critical for for understanding the seasons, climate and other geographic factors.  This interactive simulates gravity unlike anything I’ve every seen on a computer screen. 

To exploring Earth-Sun interactions, playing around with the University of Nebraska-Lincoln’s Sun Simulator is a fun way to make a little more sense of the various factors that control how the Sun appears in the sky.