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In the spring of 1912 considerable interest was excited by the sudden appearance of a brilliant star which became visible to the naked eye during some weeks in March and April. After May it was no longer visible except in powerful telescopes. Mr Slocum has attempted to measure the parallax of this star, and hence to deduce its distance from us. Parallax is a measure of the change of perspective a moving object presents when regarded from two different positions. Advantage is taken of the revolution of the earth in its orbit, and measurements are made at intervals of six months. Mr Slocum, with the great 40in refractor at the Terkes Observatory, has taken 15 photographs of the new star at three different periods of six months. Six comparison stars were selected as near the Nova as possible, and distributed approximately symmetrically round it. A discussion of the results shows that- the Nova is about 296 light years away, so that the sudden blaze of 1912 corresponded to some catastrophe which occurred in the beginning of tho 17th century.

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SEEING BACKWARD OVER 300 YEARS, Issue 15678, 17 December 1914

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SEEING BACKWARD OVER 300 YEARS Issue 15678, 17 December 1914

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