Supermoon: how an illusion makes the full Moon appear bigger than it really is - Deepstash
Supermoon: how an illusion makes the full Moon appear bigger than it really is

Supermoon: how an illusion makes the full Moon appear bigger than it really is

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Special sighting of the Moon

Special sighting of the Moon

Every few months, we have a special sighting of the Moon where it is not only a full Moon but what is known as a supermoon.

To understand why it is a supermoon, we first have to understand why different parts of the Moon are lit up at other times of the months.

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Phases of the Moon

Phases of the Moon

We see different parts of the Moon light up at different times of the month. This is because the Moon is at different positions in its orbit around Earth relative to the Sun.

  • A full Moon is when the Moon, Earth and Sun are lined up. The sunlight shines on the whole lunar surface and is reflected back to Earth.
  • A New Moon. When the Moon is between Earth and the Sun, no sunlight can reflect off its surface.
  • The Moon orbit around the Earth is an ellipse. The Moon is sometimes closer to the Earth than at other times. When it is closest to Earth and a Full Moon, it is called a supermoon.

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The moon illusion

The moon illusion

The Moon sometimes looks bigger when it's closer to the horizon. This is known as the Moon illusion, and it is just a psychological illusion.

If you cover the Moon with your thumb, you'll always be able to block it out, whether it looks small high up in the sky or looks huge closer to the horizon. This illusion is partly due to the brain thinking that objects near the horizon must be closer to us.

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