Inopus rubriceps, a pest of sugarcane in Australia.

(astronomy) The moment when the sun reaches the northernmost point of the sky, occurring on June 20–22. That would be summer solstice in the northern hemisphere and winter solstice in the southern hemisphere.

(astronomy) The moment when the sun reaches the southernmost point of the sky, occurring on December 21–22. That would be winter solstice in the northern hemisphere and summer solstice in the southern hemisphere.

December solstice, when the sun reaches the southernmost point of the sky

June solstice, when the sun reaches the northernmost point of the sky.

Pardachirus marmoratus, a small fish of the Red Sea.

plural of solar cycle

(astronomy) The nearly periodic 11-year change in the Sun's activity, measured from a minimum of activity to the next.

plural of solar engine

plural of solar prominence