Lake Tekapo sits at the heart of the Aoraki Mackenzie International Dark Sky Reserve, one of the largest gold-tier dark-sky reserves in the world and arguably the finest accessible dark sky in the southern hemisphere. Bortle 1–2 conditions prevail, and the Mount John Observatory above the lake offers public night tours. At 44°S, the southern sky is breathtaking: the Magellanic Clouds, the galactic core, the Southern Cross, and — during active periods — the aurora australis over the southern horizon. The dry inland Mackenzie climate gives far more clear nights than coastal New Zealand.