Autumn is, in many ways, a season of magic. Up north, as the dry frigidity of the breeze blows down the first of the red chinar leaves in Kashmir, in Tamil Nadu, the skies burst, and the arrival of gushing monsoons is welcomed. Somewhere in Uttarakhand, Mussoorie to be exact, the sky folds in on the horizon, and we get to see one of the most wondrous phenomena of the world: the winterline.

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