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Phases of the Moon
Author:
Keith Harrison
Move the moon (red point) to see its phases (right picture). Change time of day (blue point) to see where moon appears in the sky.
GeoGebra
This animation assumes that earth's axial tilt, and the tilt of the moon's orbit, are both zero.
New Resources
挂谷问题——三尖瓣形
Squares Question
Pythagorean Template: Integer Legs
Right Triangle Inscribed in a Semicircle
Absolute Value Functions f(x)=a |x - h| + k
Discover Resources
Construct a 60 degree angle
Ambiguous Case Discovery
Ex8 Q4
Untitled
Rolling Square-(r)en kopia
Discover Topics
Pythagoras or Pythagorean Theorem
Right Triangles
Exponent
Perimeter
Probability