There is a direct correlation between solar magnetism and the temperature of the earth. There is a direct correlation between cloud formation and cosmic rays striking the earth's atmosphere. Cosmic rays generate more clouds at lower altitude. Low clouds reflect more sunlight into space and have a strong cooling effect on the earth. Increased solar wind blocks cosmic rays striking earth.

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The sun rotates once every 25 days relative to the stars. The sun rotates once every 27 days relative to Earth.