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This is a functional planisphere coin which you can actually use to locate constellations.
Planispheres are maps of the celestial stars as seen from earth.
This is 8.25cm in diameter.
Trackable at Geocaching.com with its own icon:
How to use it:
1. Align the planisphere coin so the correct horizon name matches with the horizon you are viewing. For example: if you are looking at the northern horizon, hold the coin upside down so the name "North" meets downward with the actual northern horizon. If you are looking east, hold the coin on its side so the name "East" meets with the actual eastern horizon. The example below shows the coin rotated to match with the western horizon.
2. Rotate the disk to match with the current day and hour.
By buying this product you can collect up to 39 loyalty points. Your cart will total 39 points that can be converted into a voucher of € 0,39.