Tirion Double-Sided Multi-Latitude Planisphere

The basic design of this device is fine. But a planisphere is supposed to twirl easily around the central grommet. My new one arrived permanently bent, and frustratingly difficult to use. I attribute that to the flimsy packaging. - Michael; immediate Past President, The Royal Astronomical Society of Canada

perfect for the job, light, simple to use, will make it permanently attached to my scope so it will always be handy...

Excellent resource.