Sky brightness of horizontal solar eclipses.

Details Sky brightness of horizontal solar eclipses. Sky brightness of horizontal solar eclipses.

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998acasn..39..278l&link_type=abstract

Acta Astron. Sin., Vol. 39, No. 3, p. 278 - 286

Astronomy and Astrophysics

Astronomy

Solar Eclipses

Scientific paper

A "double dawn" record of 3000 years ago is one of the key items of the "Xia-Shang-Zhou Chronology Project". This ancient record is thought to be a horizontal solar eclipse, although puzzles still exist. A synthetic study of the sky brightness during horizontal solar eclipses is an important measure for solution of the problem. The authors have defined the descent of visual brightness in 10 minutes as the intensity of "double dawn" and so they can draw the isointensity curves which depend on eclipse magnitude and solar altitude. Therefore, they may judge whether a "double dawn" will take place at a certain place when a solar eclipse appears.

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