Southern Planisphere Geocoin - Silver

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Tracking Number: NAYETA

Teil der Coinsammlung der Kanustation Mirow / poseptun

Planishere-Southern Gold

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. They are the replacement for the planispheric astrolabe. Planispheres drastically reduced the complexities of the planispheric astrolabes and they mapped the heavens in an easier to follow chart. The first star chart to be called a planisphere was created in 1624. Planispheres are great for learning the constellations and knowing the exact position of the stars at a particular time to get more accurate readings when used with other navigational tools such as the quadrant, nocturnal, astrolabe, back staff, and sextant.

One disadvantage of translating stars from an actual spherical view our sky to a flat disk is the effect of distortion on the real size of the constellations towards the edge of the disk. It causes the images towards the edge of the disk to become stretched out. However, with some practice you will become a pro with this device in no time and be able to compensate for this distortion.

Normally, planispheres consist of several disks which map the stars as viewed from different latitudes and for different seasons. The planisphere geocoins we have made do not have interchangeable disks; however, they still give you a good idea of where the stars are at any time of day, and provide you with a pocket sized tool to help learn the constellations. Its 3.25" diameter size makes it portable, and being made out of metal makes it very durable.

This is a functional planisphere coin which you can actually use to locate constellations.

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.

3. Look at both the disk and actual sky and start correlating the constellations on the planisphere with the stars in the sky. Click on constellations to see what each abbreviation on the coin means.