Measurement of the solar diameter using the CERGA astrolabe

Details Measurement of the solar diameter using the CERGA astrolabe Measurement of the solar diameter using the CERGA astrolabe

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985crasb.301..383l&link_type=abstract

Academie des Sciences (Paris), Comptes Rendus, Serie II Mecanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Terre

Astronomy and Astrophysics

Astronomy

3

Astrolabes, Solar Diameter, Solar Instruments, Inclination, Zenith

Scientific paper

Systematic effects which appear in a series of solar diameter measurements with an astrolabe fitted with 10 prism reflectors are discussed. The series of measurements were made from 1978-84, yielding a demi-diameter less than the value in existing ephemerides. It is noted that the zenith measurements varied from 30-60 deg over the horizon, and also covered complete east-west passages. It is expected that atmospheric heating had a definite role in causing refraction in the image observed. A systematic change in diameter measurements was also detected between morning and evening data. Finally, seasonal effects include a varying distance from the sun due to heliographic inclination.

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