The Tien Shan Astronomical Observatory (TSHAO, TSAO, or Tien Shan Observatory; obs.&thinsp;code: N42; formerly also Alma-Ata Observatory and Almaty Observatory, obs.&thinsp;code: 210) is an astronomical observatory located in the Tien Shan Mountains at 2800 meters altitude, 30 kilometers south of the city of Almaty in Kazakhstan.