Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.209..415c&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 209, July 15, 1984, p. 415-427.
Astronomy and Astrophysics
Astronomy
7
Astrometry, Gravitational Effects, Optical Paths, Solar System, Space-Time Functions, Asteroids, Light Transmission, Position (Location), Solar Limb, Very Long Base Interferometry
Scientific paper
The problems of defining the bending of a light path in general stationary space-times are discussed. It is shown how in situations of axial symmetry the use of 'triangulation lines' (Cowling, 1983) leads to a coordinate invariant definition of the bending angle between arbitrary points on a light path. An exact expression is derived for the bending angle in a static, spherically symmetric space-time of arbitrarily strong curvature. This formulation is used to calculate, to second PPN order, the apparent positional shift which is measured when observing, for example, an asteroid or a spacecraft situated close to superior conjunction with the sun. The possibilities of measuring light deflection effects using modern observational facilities are considered.
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