Arnold Zenkert — Drehbaren Schulersternkarte

Pößneck [Poessneck], Lehrmittel, c1993 . Hardback. A very scarce 1990s German planisphere, for latitude 51.5 (Berlin). A delightful aid for the study of the night sky. A simple device for the recognition of the brightest stars and constellations seen from latitude 52.5 (Berlin).A useful moveable guide to reading the stars, an invaluable aid for stargazers. The first planisphere is thought to have been made in 1624 by German astronomer Jacob Bartsch.  The days of the year are marked on the outer portion of the star chart, and hours of the day and night along the edge of the rotating volvelle. The disk and the volvelle are intended to be aligned in order to identify visible stars at different times.Undated; dated circa 1993 via this list of ideal observation dates to the rear.The reverse of the card provides useful instructions on how to use the planisphere.Produced by Arnold Zenkert, a German astronomer and sundial specialist, who directed the Urania Planetarium in Potsdam. Consisting of a card disk with rotating overlaying volvelle. Externally, excellent. Disks exceptionally clean and bright. Rotating mechanism in full working order. To the reverse, a touch age toned to perimeters of disc, otherwise excellent. Fine . Ill.: Not Stated. Fine .