Errors of the Computed Times of Solar Eclipse Phenomena


WITH regard to Dr. Downing's letter on this matter (NATURE, October 10, 1912), may I be allowed to remark that I was fully aware of his warning that the computed eclipse times of second and third contacts were too late. In fact, I carried with me to Vavau the reprint of his paper to which he alludes (Monthly Notices R.A.S., vol. lxix., p. 31), which he had kindly sent me, and frequently consulted it. In addition, I had prepared an instrument for projection of the solar image so as to observe the angles of cusps given in his paper, but as Dr. Lockyer also had a similar instrument, we arranged that I should make use of his time signals.

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