The Philips 5" 51.5 degrees north Plansisphere star chart contains the brightest stars and constellations visible from the latitude of the British Isles.
A complete twenty-four hour time cycle is marked on the rim of the overlay together with the full twelve months of calendar dates are marked on the rim of the starchart. The observing window also shows the direction of the eastern and western horizons. The disk and overlay are then twisted so that the observers local time of day on the overlay corresponds to that day's date on the star chart disc.
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