E Walter and Annie S D Maunder's work helped in understanding our sun's chemical, electromagnetic and plasma properties. E Walter Maunder studied an inactive solar period (ca. 1620-1720), which was posthumously named for him as the Maunder Minimum. With ongoing concern over global warming, the Maunders' story outlines how our cyclical sun can alter climate. This book strives to illustrate how solar causes and effects can influence earth's climate in ways we must understand in order to enhance solar system research and our well-being.