The book ""The Rotation Period Of The Sun As Determined From The Motion Of The Calcium Flocculi"" by George Ellery Hale was published in 1908. The book is a scientific study that explores the rotation period of the sun by analyzing the motion of calcium flocculi. Calcium flocculi are small bright spots that appear on the surface of the sun and are believed to be associated with magnetic fields. The author, George Ellery Hale, was an American astronomer...