The Moon Illusion: Why the Moon Appears to Change Size

The video explores the moon illusion, an optical illusion where the moon appears larger near the horizon. Historical records show this phenomenon has been observed since the 4th century BC. Despite appearing to change size, the moon's size remains constant, as confirmed by measurements with a theodolite and photographs. Theories suggest the illusion is due to visual references like buildings and trees, which disappear as the moon rises. The Ebbinghaus illusion is used as a comparison. Practical techniques, such as using a pebble or a paper tube, are demonstrated to show the moon's consistent size.

What is the technique involving a small object to observe the moon's size?

Why does the moon appear smaller when it is higher in the sky?

What materials do you need to create a paper tube to measure the moon's size?