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If you look outside on September 27th, 2015,

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you can catch a glimpse of a very rare event in the night sky:

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a supermoon lunar eclipse.

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To understand what this is – first, take a full moon.

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Now add the closest approach the moon makes to the Earth on its elliptical orbit –

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which results in it looking up to fourteen percent larger in diameter.

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That's a supermoon.

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Now combine this with a lunar eclipse,

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when the Moon passes directly behind the Earth into its shadow - giving it a red tint.

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Now you have a supermoon lunar eclipse.

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This is a really special event, because it doesn't happen very often.

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Let's take a look back.

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Since 1900, a supermoon lunar eclipse has only happened 5 times.

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A lot changes here on Earth in between these moments.

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In fact, the last time you could see this event was 1982.

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And if you miss seeing it in 2015, your next opportunity won't come until 2033.

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So mark your calendar and head outside on September 27th.

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