Tirion Planisphere

Tirion Planisphere-Star Wheel Chart
American Slide Chart/Perrygraf worked with Explore Scientific to create a Planisphere for amateur astronomers. This three disk wheel chart is printed on plastic. You turn the inner wheel and select the local time and date. One side of the wheel shows the stars and constellations that are visible above the southern horizon, while the other side shows what is visible above the northern horizon. Both sides of the wheel have latitude lines which you choose to match your latitude.

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