observatory

observatory — noun

1. a place, often on a hill or mountain, where scientists use telescopes and other

1.nounB2
Definition

a place, often on a hill or mountain, where scientists use telescopes and other instruments to study the stars, the planets, or weather patterns.

Example

Visitors to the Royal Observatory in Greenwich can stand on the prime meridian line.

proper-noun pattern: the [Name] Observatory

The new observatory sits on top of Mauna Kea, far above the clouds.

typical location: on top of / high on a mountain

Common collocations
  • astronomical observatory
  • weather observatory
  • solar observatory
  • mountain-top observatory
  • at the observatory
Synonyms
  • planetarium

    a related building, but for projecting images of the night sky onto a dome — not for real telescopic observation

  • telescope station

    informal descriptive phrase; 'observatory' is the standard term

Grammar Patterns

the + Observatory (in proper names)

Usage Note

Countable; almost always used with 'the'. In proper names, capitalised as 'Observatory' (the Royal Observatory, the Paris Observatory). The astronomical sense is most common; weather and solar observatories are also normal collocations.

Common Mistakes

I want to be an observatory.
I want to work at an observatory.
an observatory is a building, not a job; the person is an 'astronomer' or 'observer'.

Word family

Synonym discussion

Sense: noun/1

An 'observatory' is a working scientific facility — usually a building on a high, dark site — where astronomers use real telescopes and instruments to study the sky or, in some cases, weather. A 'planetarium', by contrast, is a public venue with a domed ceiling onto which images of stars and planets are projected for shows and lessons; nothing is actually observed there. A 'telescope' is the instrument itself, not a place. So the Mauna Kea Observatory in Hawaii contains huge telescopes used by researchers, while the Taipei Astronomical Museum's planetarium offers indoor sky shows for visitors.

observatory ↗planetariumtelescope ↗

Common collocations

Nouns

  • observatory dome
  • observatory staff
  • observatory site

Phrases

  • astronomical observatory
  • weather observatory
  • solar observatory
  • the Royal Observatory

Prepositions

  • at the observatory
  • from the observatory

Etymology

LatinFrenchEnglish

Built from the verb 'observe' (to watch carefully) plus the Latin-derived suffix '-ory' (a place for doing something), the word entered English in the late 1600s as European astronomers began constructing dedicated buildings for telescopic study of the night sky. The famous Paris Observatory (1667) and the Royal Observatory at Greenwich (1675) helped fix the term in scientific use.