Hipparchus' spring and summer and the ellipticity of the Earth's orbit

Details Hipparchus' spring and summer and the ellipticity of the Earth's orbit Hipparchus' spring and summer and the ellipticity of the Earth's orbit

Apr 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jbaa...99...90h&link_type=abstract

Journal of the British Astronomical Association, vol.99, no.2, p.90-94

Astronomy and Astrophysics

Astronomy

History: Hipparchus, Ancient Observations

Scientific paper

Hipparchus knew that spring lasted 94.5 days, that summer lasted 92.5
days and that the year was 365.25 days long. He then went on to
calculate, from these data alone, that the eccentricity of the Earth's
orbit was 1/24 and that the apogee was 24.25 in advance of the summer
solstice. But how did he do it? And how accurate were his results?

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