Experimental observations of the sun with the CERGA astrolabe

Details Experimental observations of the sun with the CERGA astrolabe Experimental observations of the sun with the CERGA astrolabe

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....56..207c&link_type=abstract

Astronomy and Astrophysics, vol. 56, no. 1-2, Apr. 1977, p. 207-210. In French.

Astronomy and Astrophysics

Astrophysics

10

Astrometry, Solar Position, Data Reduction, Elevation Angle, Latitude Measurement, Least Squares Method, Position Errors, Solar Limb, Solar Longitude, Zenith

Scientific paper

Tentative results of solar observations conducted with the CERGA (Geodynamical and Astronomical Research Center) astrolabe are reported. The sun was observed with the upper and lower limbs crossing the reference almucantar, and transit times of each solar limb were obtained as the tangent lined up parallel to eyepiece reference wire. The apparent solar semi-diameter and the zenith distance are added or subtracted when the coordinates of the sun's center are used; otherwise the reduction method repeats that used on the planets. Latitude, longitude, and zenith distance were obtained from observations of the star field. Constant zenith distance is assumed to simplify calculations. A glass plate coated externally with a thin nickel chrome layer was employed in the work.

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