Yes, observatory is a common, singular, concrete noun.
The singular possessive form for the noun observatory is observatory's.Example: The observatory's admission is half price for children.
No. Mt Wilson observatory is in the San Gabriel Mountains and the Griffith observatory is in the Hollywood Hills. www.mwoa.org
SFA Observatory was created in 1976.
Fernbank Observatory was created in 1967.
Asiago Astrophysical Observatory was created in 1942.
The singular possessive form for the noun observatory is observatory's.Example: The observatory's admission is half price for children.
Yes, the noun observatory is a common noun, a word for any observatory.A proper noun is the name of a person, place, thing, or a title; for example:The Griffith Observatory, Los Angeles, CAObservatory Mountain, near Lincoln, MEObservatory Street, Bennington, VTThe Observatory Cafe at the Royal Botanic Gardens, South Yarra VIC, Australia
Observatory is a noun. Nouns don't have antonyms, only some adjectives and adverbs and some special verbs do.
I take that you are asking 'astronomical observatories'. 'Observatory' is a noun, observatories is the plural form. Astronomical is simple a modifier (adjective, in this case.)
Those are the observatories.
No. Mt Wilson observatory is in the San Gabriel Mountains and the Griffith observatory is in the Hollywood Hills. www.mwoa.org
The observatory is in Green Bank.
Erbil Observatory was created in 1973.
Steward Observatory was created in 1916.
Bosscha Observatory was created in 1923.
Mead Observatory was created in 2001.
Goodsell Observatory was created in 1886.