name important valley in muslim world?
There are thousands of observatories in the world, ranging from small amateur setups to large professional facilities. The exact number can vary as new observatories are built and existing ones are decommissioned.
Siegfried Marx has written: 'Sternwarten der Welt' -- subject(s): Astronomical observatories 'Observatories of the world' -- subject(s): Astronomical observatories
one of the world’s largest radio observatories
haaj
One synonym for astronomical observatories is "space observatories."
one of the world’s largest radio observatories
The Mayans had, apparently, been expert astronomers, but the first chain of astronomical observatories would be the Muslims in the 9th century. However, Stonehenge is, apparently according to a concept, an observation centre built by the prehistoric people who inhabited Europe.
Yes, there are many observatories all around Europe.
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.)
In Muslim World, family line is more important than economic status in determining social class.
Alt-azimuth is the mount ussually found in professional observatories.