Astronomy was significant in ancient civilizations. In Islam, it was recognized as having scientific principles, and helped them in determining where to face the qiblah and their praying times.
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name important valley in muslim world?
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 of the world’s largest radio observatories
Yes, there are many observatories all around Europe.
Observatories
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.
I don't know about most important but Hinduism is the third most popular religion in the world