Show Variation Noticed inSun's in inSun Sun Suns Rotation Period The sun is as fickle In most of its characteristics as well as-well well supply your our own O simile It has been found however how I ever cyer that this Inconsistency Is probably probably probably ably a periodic function so that the sun will vary from maximum to minimum minImum min min- in its behavior over oyer a fixed period perIod period pe pe- of ot years For example Dr Charles St. St John of the Mount Wilson Nilson observatory in do California has discovered that the period period period pe pe- of rotation of the sun has been Increasing The sun In other words Is slowing down In 1870 the equatorial equa equa- tonal speed of the thc suns sun's rotation was wag 2 S kilometers per second In 1015 1915 It was us lOG and by 1028 the sun had I slowed down own to kilometers per second It Is believed belle however howe that this decrease will not be constant and that beginning in 1020 the sun will gradually pick up speed again until It reaches a maximum period of rotation within the next few years |