# planisphere

> English word · Noun · IPA /ˈpleɪ.nɪˌsfɪɚ/

## Definitions
1. Any representation (map projection) of part of a sphere on a plane surface.
2. A map constructed by stereographic projection, as described in Ptolemy's treatise Planisphaerium and later used in planispheric astrolabes
3. A map of the whole world, especially those from the 16th–17th century
4. Any of several charts of the celestial sphere having an overlay or window that may be adjusted to show the stars visible at a particular time, or from a particular place.

## Etymology
From plani- + sphere or plani- + -sphere.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/planisphere