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Now let's generate a space fact while we learn a brand new operator called – drum roll please – the *modulus*.

The idea behind the modulus is to show you the remainder after you divide a number.

So, if you divide `13 / 5`

, `5`

goes into `13`

two times, and there will be `3`

remaining. A modulus, denoted by a `%`

, would take `13 % 5`

and return the remainder `3`

.

How on Earth is this useful?

Let's ask a question a modulus can solve: What will the moon phase be one year from today?

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