- Philip&Apos;S Planisphere: Shows the Principal Stars Visible for Every Hour in the Year for Latitude 51. 5 N, Canada, Northern Europe

London, George Philip and Son, Ltd, 1982 . Hardback. A very scarce 1982 Philips' Planisphere for latitude 51.5 N, for Canada and Northern Europe. 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 51.5 N.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 overlay. The stars visible at a particular date and time can be seen through the elliptical aperture in the overlay, by aligning the disk and the overlay accordingly.To the rear of the planisphere are instructions for its use in English, French, German and Danish.Constructed out of two rotating volvelles.In exceptional condition. Consisting of two rotating plastic volvelles. Externally, excellent. Rotating mechanism in full working order. Exceptionally bright to the reverse. Fine . Ill.: Not Stated. Fine .

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