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For them to occur in the UK we need to be on the edge of an area of high pressure, with a brisk wind blowing at a right angle to a hill or mountain range.

It took a couple of runs to get the right angle and then it was down to waiting for a good start.

Ruble perfected her movements in sync with the music and the other dancers, her head tilted at just the right angle, her arabesque hitting the correct line, her discipline and note-taking clearly paying off.

They were flat like paintings but sculptural in their defiance of right angles.

He spent hours talking and sharing stories, and they tolerated his fussiness, looking for just the right angle, just the right light.