Hanle protects its dark skies and builds a future on stargazing, PgII.

Key Highlights:

• Hanle in Ladakh is now protected as India’s first dark sky reserve, minimizing light pollution for astronomical observation.
• The Hanle Dark Sky Reserve is managed through a collaboration between the Indian Institute of Astrophysics (IIA), the Union Territory of Ladakh, and the Ladakh Hill Development Council.
• The third edition of the annual "star party" was held from September 18 to 23, 2025, attracting astronomy enthusiasts and astrophotographers.
• The reserve attracted around 10,000 visitors in 2024, boosting the local economy through astro-tourism.

Detailed Insights:

• Hanle's location within the Changthang Wildlife Sanctuary and its exceptionally clear skies (Bortle-1) make it ideal for astronomical observations.
• The Indian Astronomical Observatory in Hanle hosts several telescopes, including the Himalayan Chandra Telescope and the GROWTH India Telescope, facilitating advanced astronomical research.
• To minimize light pollution, the IIA has provided residents with lamp shades, blackout curtains, and warm-toned bulbs, ensuring the pristine dark sky environment is maintained.
• Local youth have been trained as "Astronomy Ambassadors" to conduct night-sky tours, providing them with income and promoting astronomy education.
• The annual star party serves as a platform for astronomy education, hands-on learning, and collaboration among enthusiasts and professionals.
• Hanle's unique atmospheric conditions, including low oxygen, low humidity, and high ultraviolet radiation, are suitable for astronomy but require visitors to acclimatize.
• Efforts are underway to preserve local traditional knowledge of the night sky by collecting stories, proverbs, and folk songs from elders in Hanle and surrounding areas.
• Plans are in progress to build a mini-planetarium and a transparent dome called the ‘Astroglobe’ to further boost astro-tourism in the region.

Key Concepts Involved:

• Dark Sky Reserve: A designated area with exceptionally clear skies, maintained by minimizing light pollution.
• Astrotourism: Tourism focused on observing the night sky and celestial objects.
• Light Pollution: Excessive or misdirected artificial light that obscures the night sky.