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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
Isosceles Triangle: Quick Construction
Piano. Keyboard.
Play C3 E3 G3 C4_C4
Cross Product in 2D and 3D
"Compressed" Astroid as Envelope
Discover Resources
lingkaran
Sum of angles in a triangle
Maria's Translation
ineq_from_points
sin(x) and circle
Discover Topics
Cosine
Quadratic Equations
Similarity Transformation or Similarity
Centroid or Barycenter
Hyperbola