The Hanle Dark Sky Reserve in Ladakh, India’s first such protected region is preserving the pristine Himalayan night skies while promoting astrotourism, scientific research, and local livelihoods

About Hanle Dark Sky Reserve

• Objective: To preserve dark skies, minimise light pollution, and promote astrotourism alongside scientific research.
• Location: Hanle, within the Changthang Wildlife Sanctuary, Ladakh.
• Established under: MoU between Indian Institute of Astrophysics (IIA), UT of Ladakh, and the Ladakh Hill Development Council.
• Recognition: India’s first Dark Sky Reserve; among the world’s few Bortle-1 rated skies — the highest clarity rating (on a 9-point scale).
• Ideal Conditions: Clear skies, low humidity, minimal particulate matter, and limited light pollution make Hanle a world-class site for optical and gamma-ray astronomy.
• The Hanle Indian Astronomical Observatory houses:
  • Himalayan Chandra Telescope
  • GROWTH India Telescope (IIA–IIT Bombay collaboration)
  • High Altitude Gamma-Ray Telescope Array 
  • Major Atmospheric Cherenkov Experiment (BARC collaboration)

Initiatives for Preserving Himalayan Night Skies

To Reduce Light Pollution

• Community-based Measures: Distribution of lamp shades, blackout curtains, and warm-toned bulbs to homes and public infrastructure.
• Astronomy Ambassadors: Local youth trained to conduct night-sky tours for tourists.
• • They provide astronomy education and generate part-time income, blending science with livelihood.

Astrotourism and Community Development

• Annual “Star Party”: Held since 2023, with participants including professional astronomers, astrophotographers, and tourists.
  • Observed phenomena: 
    • Zodiacal light (scattering of sunlight by dust in the inner Solar System).
    • Gegenschein (a faint glow opposite the Sun).
    • Belt of Venus (a pink twilight band above Earth’s shadow).
• Community-based Tourism: Visitors are encouraged to participate in stargazing tours and educational events.

Future Plans and Infrastructure

• Mini Planetarium: Under construction to enhance visitor experience.
• ‘Astroglobe’ Dome: Planned transparent dome to allow year-round stargazing during harsh winters.
• Integration of Indigenous Knowledge: Local educators and ambassadors are documenting traditional sky lore, folk songs, and proverbs, linking science with culture.

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