Babylonian Timings of Eclipse Contacts and the Study of the Earth's Past Rotation

Details Babylonian Timings of Eclipse Contacts and the Study of the Earth's Past Rotation Babylonian Timings of Eclipse Contacts and the Study of the Earth's Past Rotation

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jahh....9..145s&link_type=abstract

Journal of Astronomical History and Heritage (ISSN 1440-2807), Vol. 9, No. 2, p. 145 - 150 (2006).

Astronomy and Astrophysics

Astronomy

Babylon, Earth Rotation, Eclipses

Scientific paper

Long-term changes in the length of the day are investigated using an extensive series of Late Babylonian timings of lunar and solar eclipses. The dates of these observations range between about 700 BC and 50 BC. In recording the times of eclipse contacts, the Babylonian astronomers reported time intervals rather than specific moments. Hence scribal errors tend to be cumulative. To reduce this effect, I have concentrated in this paper almost exclusively on first contact observations. Analysis of these measurements leads to a result for the parameter AT of 31.7 ± 0.3 sec/cy/cy and a mean rate of change in the length of the day over the selected interval of 1.74 ± 0.03 ms/cy.

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