Measuring the Moon

Sometimes, when it's close to the horizon, the Moon appears larger than when it is high in the sky. Is It really larger, or is It just an optical illusion? Try this experiment and find out!

You will need:

flat piece of glass (like from a picture frame) pair of work gloves crayon or marker help from an adult!

Here's what to do:

1. Ask an adult to help you and wear work gloves when handling the glass. As the Moon appears over the horizon, look at it through the square of glass held out at arm's length and trace its shape onto the glass with a crayon.

2. After the Moon is high in the sky. look at it again through the glass. Does it still fill the circle you drew earlier? What conclusions can you draw from this observation?

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