Located in the Himalayas, Hanle is a small village that has become a prominent stargazing destination thanks to its exceptionally dark skies. Known for having a Bortle-1 rating, the highest clarity level on a nine-point scale, Hanle is now designated as India”s first dark sky reserve. This initiative is part of a collaboration between the Indian Institute of Astrophysics (IIA) based in Bengaluru, the Union Territory of Ladakh, and the Ladakh Hill Development Council in Leh.
The Hanle Dark Sky Reserve serves as a government-funded project that emphasizes sustainable development while minimizing light pollution. Nestled within the Changthang Wildlife Sanctuary, the reserve houses the Indian Astronomical Observatory, which features multiple telescopes for astronomical research. According to Dorje Angchuk, the engineer in charge of the Observatory, the region”s clean air, low light pollution, and minimal atmospheric interference make it ideal for observing celestial phenomena.
To combat light pollution, the IIA has provided the village with lamp shades, blackout curtains, and warm-toned bulbs. Furthermore, to promote astrotourism, the IIA has trained 25 local youth, including 18 women, to become “Astronomy Ambassadors.” These individuals are equipped with telescopes and are educated in basic astronomy concepts, enabling them to lead night-sky tours for visitors, thus providing them with a supplementary income.
Annual Star Party Celebrates Astronomy
Since 2023, the Hanle Dark Sky Reserve has hosted an annual “star party,” where astronomy enthusiasts gather to celebrate the night sky. The third event took place from September 18 to September 23 this year, attracting participants ranging from beginners to seasoned stargazers. The gathering provides a platform for astronomy education, hands-on learning, and collaboration among attendees.
This year”s star party saw 47 participants, including professional stargazers and volunteers from the Bangalore Astronomical Society. Early sessions included tutorials and lectures on maximizing the use of the clear skies, while the nights were dedicated to observing and photographing celestial objects. Ajay Talwar, an amateur astronomer and telescope maker, noted the unique astronomical phenomena visible from Hanle, such as zodiacal light and the gegenschein, which can only be seen in this remarkable location.
Impact on Local Economy and Education
The influx of tourists to Hanle has significantly benefited the local economy. Rangdol Dorje, an Astronomy Ambassador, reported that the reserve welcomed around 10,000 visitors in 2024, with many expressing a desire to see the stars. Tsering Skitzom, another Astronomy Ambassador, highlighted the importance of sharing their astronomical heritage with the world, emphasizing practical learning through telescopes.
During the winter months, when tourist numbers decline due to cold weather, Astronomy Ambassadors focus on educating local schoolchildren about astronomy and their cultural heritage. Padma Ishey, an Ambassador, explained that this alternative educational approach helps students better connect with their own culture.
Plans for the future of the Hanle Dark Sky Reserve include the construction of a mini-planetarium and a transparent dome called the “Astroglobe” to enhance the stargazing experience for visitors during harsh winter conditions. With its motto “come for the mountains, stay for the stars,” Hanle exemplifies how preserving dark skies can foster community growth and environmental stewardship.
