1. flat circular maps showing the stars visible from a particular location at different times of the year, typically with a rotating overlay to show which stars are visible at any given time
Usage: astronomy; plural of planisphere

Examples

• The astronomy students used planispheres to identify constellations during their nighttime observation session.
• Many planispheres are designed for specific latitudes to ensure accurate star positioning.
• The teacher distributed planispheres to help the class locate the Big Dipper in the night sky.
• Modern planispheres often include both Northern and Southern Hemisphere star patterns.
• Amateur astronomers rely on planispheres as portable guides for stargazing expeditions.
• The museum’s gift shop sold planispheres alongside telescopes and other astronomy equipment.