Ranking Task: Ordering Lunar Phases (3-D, variable sun)

This ranking task presents the student with a three-dimensional image of the Earth with the sun and moon 'orbitting' around the outside of the celestial sphere and asks the student to rank the figures based on the lunar phases, beginning at a randomly selected starting phase. It uses a variable position for the sun across each figure and and allows the student to rotate the image by pressing the 'shift' key. Compare this RT versus 'RT_LunarSunMoon1CelestialEquator' where the sun is kept at a fixed position for each figure.