THE SUN
Sir-In a very interesting article entitled "The Sun Caused the Trouble" which appeared in The Listener of August 8, there occurred this phrase: "when the rotation of the sun brought the same sun-spotting back to face the earth." Now, during my school days we were taught that the sun was "fixed," and I have always understood this to mean that the sun did not move upon an orbit, nor did it rotate. I understand, too, that the:moon does not rotate, although it moves around the earth. A note- of confirmation on this subject would be
much appreciated.-
B.
R.
(Foxton),
As the correspondent says, the position of the sun is fixed. The article did not mean that the sun rotated round the earth. It did mean that the sun itself is not fixed or stationary. The sun also rotates on an axis of its own. Because it is not solid (only 1.4 times more dense than water), the period of this rotation varies in different latitudes of the sun from 2414 days to the equator to about 33 days at latitude 75 degrees. Roughly, the rotation occurs every four weeks, so that sun-spots might be expected to recur in four-weekly periods. If sun-spots were increasing in activity, radio interference might be worse four weeks after its first manifestations. If sun-spots were decreasing, an improvement might be expected.-Ed.
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New Zealand Listener, Volume 5, Issue 117, 19 September 1941, Page 4
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229THE SUN New Zealand Listener, Volume 5, Issue 117, 19 September 1941, Page 4
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