site.btaThousands Visit National Astronomical Observatory Rozhen on Its Open Day
National Astronomical Observatory Rozhen (BTA Photo)
Thousands of visitors came to Rozhen on Sunday for the Open Day of the National Astronomical Observatory (NAO). Traditionally, the doors of the NAO are opened on Pentecost, which is the patronal holiday of the Sveta Troitsa chappel, located near the entrance to the tower with the two-meter telescope.
/MR/
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