Accession Number : AD0654628

Title :   THE TWILIGHT CUSP EXTENSIONS OF VENUS,

Corporate Author : RAND CORP SANTA MONICA CALIF

Personal Author(s) : Schilling,G. F. ; Moore,R. C.

Report Date : JUN 1967

Pagination or Media Count : 11

Abstract : It has been known since about 1790 that when Venus is near inferior conjunction, the cusps of her crescent extend far beyond a half-circle. It is further known that Venus, at greatest elongation, does not present the expected half-moon shape, but rather appears convex towards the illuminated side. This leads to a discrepancy of the order of days between date of apparent and geometric dichotomy, not satisfactorily explained to date. On the basis of our study, we are forced to infer that the scattering atmosphere of Venus extends to considerable heights above the cloud deck, and that its luminosity characteristics are not too far different from those of the earth's atmosphere. Height variations of the scattering atmosphere itself appear therefore to be immaterial, but small height variations of the probably uneven top of the opaque cloud deck would explain observed effects.

Descriptors :   (*VENUS(PLANET), ANOMALIES), (*PLANETARY ATMOSPHERES, VENUS(PLANET)), CLOUD COVER, SCATTERING, BRIGHTNESS, TWILIGHT

Subject Categories : Astrophysics

Distribution Statement : APPROVED FOR PUBLIC RELEASE