National Astronomical Research Institute of Thailand Thai National Observatory (TNO) is NARIT's main facility, atop Thailand's highest mountain, Doi Inthanon in Doi Inthanon National Park, Chom Thong District, Chiang Mai Province. The concept of a national astronomical research institute was discussed for the first time in the Assembly of the Deans of the Faculty of Science in Thai universities. On July 20, 2004, commemorating His Majesty King Bhumibol's 80th Birthday Anniversary in 2007 and marking the bicentenary of the life and work of King Mongkut the "Father of Thai Science" the government approved the establishment of the National Astronomical Research Institute of Thailand (NARIT), under the
Doi Suthep 1981 and has an area of that includes the Wat Phrathat Doi Suthep temple as well as Bhubing Rjanives Palace, further up the mountain. Doi Pui, the other peak of the massif, is closeby via a surfaced road as well as through forest paths. Hmong hill tribe people live in the surrounding area. The chief of Doi Suthep-Pui National Park voiced his concerns in 2018 about the increasing amount of garbage produced by the large number of tourists visiting Doi Suthep temple, a must-see site for Chiang Mai tourists. Untreated water and garbage from more than 300 shops and a