Bosscha Observatory

Bosscha Observatory is Indonesia's oldest modern observatory located in Lembang, West Bandung Regency, West Java, at about 1,310 meters elevation. Established in 1923 by Dutch tea plantation owner K.A.R. Bosscha and inaugurated in 1928, it is operated by Institut Teknologi Bandung. Notable for its historic Zeiss double refractor telescope and heritage buildings, it serves as a research, education, and public outreach center for astronomy.

Visitors can expect a historic hilltop observatory complex surrounded by pine trees and tea plantations. The site features heritage domed buildings housing large telescopes, including the 60-cm Zeiss double refractor. Visits are guided and by reservation only, with daytime tours explaining astronomy and the observatory's history, and evening sessions for stargazing when weather permits. Areas include exhibition spaces, telescope domes, and outdoor grounds.

Initiated by Karel Albert Rudolf Bosscha, a Dutch tea plantation owner, construction began in 1923 and the observatory was inaugurated in 1928 as the Bosscha Sterrenwacht. It was built to advance astronomy in the Dutch East Indies and houses the Zeiss double refractor, one of the largest telescopes in Southeast Asia at the time. Now operated by Institut Teknologi Bandung (ITB), it is designated as a national cultural heritage object and remains Indonesia's oldest functioning observatory.

Designated as a cultural heritage site of Indonesia, the observatory is a center for astronomy education and public outreach, managed by the Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung. It plays a significant role in science literacy and is an iconic educational tourism destination in West Java.