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I need a nerd to explain this joke to me.

In astronomy arc-minutes are represented with a single tick mark like this '

and arc-seconds are represented with a double tick mark like this ''

So 10-15' means 10 to 15 minutes.

Ah. I didn't know where the notation came from. It's common use in Greece!

Hehe, I just like it better, it's easier :P

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