The Earth Rotates

What this lesson shows

• The sky appears to move, but the motion comes from the Earth rotating.

• The observer’s viewpoint creates the illusion of a moving dome.

• A fixed axis defines direction; stars appear to circle that axis.

• Using the correct frame (Earth rotating, sky effectively fixed) simplifies the system.
  
  

How to use the controls

• 🔈 Speak / Stop: Play or Stop narration.