NAKED EYE SUNSPOT.
FEBRUARY GROUP RETURNS.
THE METHOD OF OBSERVING.
The very large sunspot which was visible to tho naked eye early in February is again visible on the solar surface at tho present timo, having survived a complete rotation of the sun. It was, first, seen on February 10, when it was easily visible without telescopic aid. On February 18 it passed round the sun's western edge, and was hidden from view until March 4, when it came into view once more on the opposite limb. The sunspot has since passed gradually across the disc, until it is now a little west of tho sun's centre. For over a month this splendid group has endured with no diminution in size, the disturbed area being about 36,000 miles in diameter at the present timo, as compared with 20,000 miles in February, but the structure of the spots indicates the breaking up of the group is now beginning.
Those who desire to look for this spot with the unaided eye should look when the sun is obscured by misty clouds or is rendered less bright when setting. At all other times it is necessary to shield the eyes from the intense glare by using a piece of coloured glass or plain glass smoked over a candle flame.
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Bibliographic details
New Zealand Herald, Volume LXVI, Issue 20203, 13 March 1929, Page 10
Word Count
216NAKED EYE SUNSPOT. New Zealand Herald, Volume LXVI, Issue 20203, 13 March 1929, Page 10
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