Shamakhi Astrophysical Observatory
Encyclopedia
The Nasīr al-Dīn al-Tūsī
Nasir al-Din al-Tusi
Khawaja Muḥammad ibn Muḥammad ibn Ḥasan Ṭūsī , better known as Naṣīr al-Dīn al-Ṭūsī , was a Persian polymath and prolific writer: an astronomer, biologist, chemist, mathematician, philosopher, physician, physicist, scientist, theologian and Marja Taqleed...

 Shamakhi Astrophysical Observatory
is located in Shamakhi
Shamakhi
Shamakhi or Shamakhy is a rayon of the Republic of Azerbaijan, and a town in the rayon. It is the historical center of the region of Shirvan.The town is west of Baku. It has more than 20,000 inhabitants, among them Azerbaijanis and Russians...

, Azerbaijan
Azerbaijan
Azerbaijan , officially the Republic of Azerbaijan is the largest country in the Caucasus region of Eurasia. Located at the crossroads of Western Asia and Eastern Europe, it is bounded by the Caspian Sea to the east, Russia to the north, Georgia to the northwest, Armenia to the west, and Iran to...

, on the northern-eastern slope of the Pirqulu mountain, at an altitude of 1,435 m. Construction of the observatory began in 1958 in then Azerbaijan SSR
Azerbaijan SSR
The Azerbaijan Soviet Socialist Republic , also known as the Azerbaijan SSR for short, was one of the republics that made up the former Soviet Union....

 and officially opened on January 13, 1960.

During the Soviet period
Soviet Union
The Soviet Union , officially the Union of Soviet Socialist Republics , was a constitutionally socialist state that existed in Eurasia between 1922 and 1991....

, the observatory measured the light polarization of Comet d'Arrest.
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