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Jun 21, 700
Wind usedd to smelt metal from rock in Sri Lanka
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Jun 21, 1200
The horizontal axis postmill was built and used in Europe
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Jun 21, 1200
Genghis Khan forces Persians to build windmills for irrigation
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Jun 21, 1500
Tower windmills with cloth sails were used in Spain
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The Netherlands and Englad had about 10,000 windmills
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Horace de Saussure invents the first solar collector
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Augustin Mouchot patents a solar engine
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Clarence Kemp patents first solar water heater
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Da Vinci proposes the first industrial applications of solar concentrators
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Windmills ground corn meal in Persia.