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In astronomy, a planisphere is a star chart analog computing instrument in the form of two adjustable disks that rotate on a common pivot. it can be adjusted to display the visible stars for any time and date.. These images are details from the centre of the northern and southern hemisphere milky way wheels. click the images for a larger view of the wheel.. Abbé nicolas-louis de lacaille, formerly sometimes spelled de la caille, (french: ; 15 march 1713 – 21 march 1762) was a french astronomer.
The evening sky map to help find your way around the night sky, skymaps.com makes available for free* each month the evening sky map -- a 2-page monthly guide to the night skies of the world -- northern and southern hemispheres, and the equatorial regions.. Using the star wheel. pick the date and hour you want to observe, and set the star wheel so this date (on the rim of the circular disk) matches the time indicated along the edge of the outer sleeve..