Earth, Moon, and Observer Simulation
This simulation shows how the Moon’s position and a person’s viewpoint affect observed angles.
Use the sliders or arrow keys to rotate the Moon and the person. Screen readers will announce angle changes.
Use the Moon and Person controls to rotate their positions.
How to Use the Sim
Step 1: Click the toggle button to toggle between an Earthling's view and an alien's point of view.
Step 2: Click the play button to move the Moon and Earth at the same rate.
Step 3: Click the fast forward to move ahead one degree of rotation/revolution.
Step 4: Click the reverse button to move back one degree of rotation/revolution
Keyboard Shortcuts
Tab: move to the next field.
ShiftTab: move to previous field
Space: click an item
LeftArrow: move Moon counterclockwise
RightArrow: move Moon clockwise
UpArrow: move Earth counterclockwise
DownArrow: move Earth clockwise
Credits:
"Earth Day Map", "Earth Night Map", "Earth Cloud", and "Moon" by Solar System Scope](https://www.solarsystemscope.com/textures/) is licensed under [CC BY 4.0]
