Size from Earth

Demonstrate an understanding that the Moon and Sun appear to be the same size when viewed from Earth

The Sun is approximately 400 times further away from us than the Moon.

The Moon is 400 times smaller than the Sun.

Because of this, the Sun and Moon appear to look the same size in the Sky.

 

 

 

Data

 

Approx. Size (km)

Average Distance (km)

Sun

1,400,000

150,000,000

Moon

3,500

385,000

Sun divide Moon

400

390


Task

Estimate with your fingers how large you think the Moon to be at arms length. Next time you see the Moon, try this again. Does it surprise you?