CanCarrier

By CanCarrier

Astrolab.

Love these things, never seen so many in one place as the National Maritime Museum. This one is Iranian, didn't get the date.

They are for measuring how high the North Star is above the horizon in order to ensure the faithful are called to prayer at midnight.

Basically if you know where you are you can use it to tell the time, and if you know what time it is you can figure out where you are.

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