Planisphere facts for kids
In astronomy, a planisphere is a projection of the celestial sphere onto a plane. Because of the projection, certain parts of the celestial sphere cannot be shown. Hipparchus discovered that it was possible to do a projection which keeps the angles intact.
Images for kids
Medieval planisphere,c.1000. National Library of Wales MS 735C, Aberystwyth.
Planisphere Facts for Kids. Kiddle Encyclopedia.