Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004gida...30a..38h&link_type=abstract
Giornale di Astronomia (ISSN 0339-1106), Vol. 30, N. 1, p. 38 - 53 (2004)
Astronomy and Astrophysics
Astronomy
History, Venus: Transits
Scientific paper
The Venus transit on the Solar disc was for the first time observed in 1639, using "modern" instruments, by Gassendi. Yet since the following transit, an effect was perceived which modified Venus and Sun profiles at the moments of the first and second visual contact between the two celestial bodies. This effect was called "gutta nigra", i.e. black drop. Horn d'Arturo was widely interested in studies on the vision and on its effects on astronomical observations. In the following paper, he suggested what probably was the first correct explanation of the black drop effect. As stated on the Dictionary of Scientific Biography (ad vocem), Horn "clarified the effect on vision, especially in the astigmatic eye, of the suture of the eye lens and the formation of the so-called black drop".
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