Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1927
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1927natur.119..318f&link_type=abstract
Nature, Volume 119, Issue 2991, pp. 318-319 (1927).
Astronomy and Astrophysics
Astronomy
Scientific paper
THE article by Dr. E. W. Brown on ``Changes in the Length of the Day'' in NATURE of Feb. 5 cannot fail to attract attention. To avoid any possible misunderstanding I think I ought to explain that the references which Dr. Brown makes to my results refer to my paper, ``A Solution of Ancient Eclipses of the Sun,'' published in the Monthly Notices of the Royal Astronomical Society, Dec. 1920, not to my paper entitled ``Trepidation'' in Monthly Notices for Dec. 1926, which Dr. Brown had not seen at the time of writing. In the latter paper I show that if we adopt 4''.8 as the change in the apparent longitude of the moon in a century, due to any acceleration not recognised in the existing gravitational theory or to changes in the length of the day, the Greenwich meridian observations give 1''.36+/-0''.15 as the corresponding change in the apparent longitude of the sun, thus confirming the result which Dr. Brown cites from my work on ancient eclipses. I also find that any correction to the assumed century accumulation for the moon requires a correction of 1/9.5 as much to the deduced accumulation for the sun, so that the latter term is very little dependent on the value obtained for the lunar term.
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