• ●Hanle Dark Sky Reserve: notified by the Government of Ladakh in December 2022; India's first dark sky reserve, lying within the Changthang Wildlife Sanctuary.
• ●Two pillars: curbing light pollution for research, and astro-tourism benefiting local communities.
• ●Anchor: Indian Astronomical Observatory, Hanle, run by the Indian Institute of Astrophysics (IIA), Bengaluru, an autonomous institution under DST.
• ●HDSR Astronomy Ambassadors: 25 trained local villagers running tours, given telescopes by the Ladakh government.
• ●Also at Hanle: MACE, BARC's 21-m imaging Cherenkov telescope (inaugurated 4 October 2024), the world's highest of its kind at ~4,300 m.
• ●Proposed: 3.7-m upgraded Himalayan Chandra Telescope and 13.7-m National Large Optical-infrared Telescope.
• ●Bortle scale rates night-sky darkness from 1 (darkest) to 9; Hanle offers Bortle-1 skies.

Which institution operates the Indian Astronomical Observatory at Hanle, which anchors India's first dark sky reserve?