月の満ち欠け実験室｜太陽・地球・月を動かす

This science app for elementary school 6th graders to junior high school 3rd graders allows you to observe the phases of the moon while changing the positions of the sun, Earth, and moon.

You can drag and drop celestial bodies to rearrange their positions and move the moon's position with a slider. You can choose from 8 different moon phases to compare and continuously observe the moon's movement using the play button.

It's useful for trying out the relationship between sunlight and the appearance of the moon, which can be difficult to understand just by looking at diagrams.