A visual observational study of the extension of the cusps of Venus, 1937 - 1998.

Details A visual observational study of the extension of the cusps of Venus, 1937 - 1998. A visual observational study of the extension of the cusps of Venus, 1937 - 1998.

Apr 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000stast..42...67h&link_type=abstract

Strolling Astron., Vol. 42, No. 2, p. 67 - 72

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Venus Atmosphere

Scientific paper

It has long been known that the atmosphere of Venus prolongs the cusps of that planet when it is a narrow crescent and even exhibits Venus as a ring of light when very close to inferior conjunction. Clearly, less striking cusp-extensions must exist at other phases. An analysis was made of the white-light visual estimates and the micrometer measures to see how the perimeter of the illuminated limb varies with the phase angle, the angle at Venus between the directions to the Sun and the Earth. A simple approximate formula was derived from spherical trigonometry to compute the breadth of the twillight arc produced by the planet's atmosphere.

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