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Find this orientation by looking through the crystal at the sky at a time when you can see the sun, mark the sun's direction on the crystal, and your mark will always point towards the sun when you match the beams from even a tiny patch of blue in an otherwise overcast sky.
ECONOMIST: How Norsemen found their way round in cloudy weather
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To mark the switchover the Crystal Palace transmitter, in south London, will be lit up on Wednesday night with 200, 000 watts of energy efficient lighting at a ceremony attended by Sir David Attenborough and DJ Chris Evans.
BBC: London analogue TV signal switched off
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But if anybody claims to have a crystal ball out there, that person is lying, says Mark Burnett, better known as the creator of Survivor.
FORBES: The Trendsetters