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.)
Yes, there are many observatories all around Europe.
Observatories
Siegfried Marx has written: 'Sternwarten der Welt' -- subject(s): Astronomical observatories 'Observatories of the world' -- subject(s): Astronomical observatories
Alt-azimuth is the mount ussually found in professional observatories.
in the solar system, distances are measured in AU's which stand for atronomical units.
yes
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observetories
observatories
mountains
Roger Hutchins has written: 'British university observatories, 1772-1939' -- subject(s): Astronomical observatories, History
stone like buildings an observatories