Solar radiation

See under Exposure.

Term used in soil science and geography for the position of a vineyard slope in relation to the direction of the midday sunlight (direction of incidence of the sun's rays). It is given in degrees in relation to the northern direction (often simply as "south-facing" or similar):

0° = north-facing slope - no sun, often also referred to as "shady side"
90° = eastern slope - lots of morning sun
180° = south-facing slope - often referred to as the "sunny side"
270° = west-facing slope - lots of evening sun; exposed to strong Wetterweather...

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