The moon and the sun

Science
Grade 6

The moon looks different from day to day: half, full, or a thin crescent. When you watch it, you notice that the sun is always on the bright side of the moon. In a model experiment, shining a light on a ball makes only the lit side look bright, and moving the ball or the light changes the shape of the bright part. The shape of the moon changes in the same way, depending on where the sun and the moon are. Because that position shifts little by little, the moon waxes and wanes and looks different each day.

Moon phases

Grade 4

The number of days since the new moon is called the Moon’s age. The lit side of the Moon always faces the Sun. Check the Sun, Earth and Moon in the space view, then compare it with the shape in the small window at the top left.

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Moon age: 15.3 days ・ Illuminated fraction: 100%

Positions in space

Sunlight lights up half of the Moon. As the Moon moves around Earth, our view of that bright half changes. These are the Moon’s phases. Grade 6

Sun and Moon above the horizon

Explore a 3D model of the sky around the ground. Drag to turn it, then play a day to follow the Sun and Moon.

Sun

Moon

About this model


Thursday, October 8, 2026