planisphere: meaning, definition, pronunciation and examples
Very low / specializedFormal, technical, academic, historical
Quick answer
What does “planisphere” mean?
A flat, circular map projection of the celestial sphere, typically showing stars visible from a particular latitude and designed to be adjusted for the time and date of observation.
Audio
Pronunciation
Definition
Meaning and Definition
A flat, circular map projection of the celestial sphere, typically showing stars visible from a particular latitude and designed to be adjusted for the time and date of observation.
Any projection of a sphere onto a plane; historically, a type of star chart or astrolabe used for astronomical calculations and identifying stars and constellations.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or usage. The term is identically used in scientific and historical contexts in both varieties.
Connotations
Technical precision, historical astronomy, educational tools for stargazers.
Frequency
Equally rare in both varieties, confined to specific technical/hobbyist fields.
Grammar
How to Use “planisphere” in a Sentence
[Verb] a/the planisphere (e.g., consult, rotate, adjust)planisphere of [place/time] (e.g., planisphere of the northern hemisphere)planisphere for [purpose] (e.g., for stargazing)Vocabulary
Collocations
Examples
Examples of “planisphere” in a Sentence
adjective
British English
- The planisphere projection distorts areas near the edge.
American English
- The planisphere map was useful for plotting great-circle routes.
Usage
Meaning in Context
Business
Not used.
Academic
Used in astronomy, history of science, and cartography papers to describe specific instruments or map projections.
Everyday
Virtually unused. Might be encountered by amateur astronomers or in hobbyist contexts.
Technical
Primary domain. Refers to a specific instrument for identifying stars, or a type of map projection.
Vocabulary
Synonyms of “planisphere”
Vocabulary
Antonyms of “planisphere”
Watch out
Common Mistakes When Using “planisphere”
- Pronouncing it as 'plain-isphere' (it's 'plan-i-sphere').
- Confusing it with a terrestrial planisphere projection (like the Azimuthal Equidistant projection centered on the North Pole).
- Using it as a general term for any globe or sphere.
FAQ
Frequently Asked Questions
No. A globe is a spherical model of a celestial body (like Earth). A planisphere is a flat, two-dimensional representation of the celestial sphere, designed as a tool for observation.
No. Most planispheres are designed for a specific range of latitudes (e.g., 30°-60° North). Using one designed for the Northern Hemisphere in the Southern Hemisphere will show an incorrect and upside-down sky.
A planisphere is a physical, analog tool made of paper or plastic with rotating parts. An app is digital, often more precise, and can automatically adjust for location, time, and show non-visible objects like planets in real-time.
No, it is a very low-frequency, specialized term. In everyday language, people are more likely to say 'star chart' or 'star finder'. 'Planisphere' is used in technical, historical, or precise hobbyist contexts.
A flat, circular map projection of the celestial sphere, typically showing stars visible from a particular latitude and designed to be adjusted for the time and date of observation.
Planisphere is usually formal, technical, academic, historical in register.
Planisphere: in British English it is pronounced /ˈplanɪsfɪə/, and in American English it is pronounced /ˈplænɪsfɪr/. Tap the audio buttons above to hear it.
Phrases
Idioms & Phrases
- “None”
Learning
Memory Aids
Mnemonic
Think: PLANEt SPHERE flattened onto a PLANE. A planisphere is a flat (plane) representation of the starry sphere.
Conceptual Metaphor
THE NIGHT SKY IS A MAP (The planisphere concretely maps the abstract, rotating vault of heaven).
Practice
Quiz
What is a planisphere primarily used for?