Abstract
The gravitational focusing effect of the Sun is one of the most amazing discoveries produced by the general theory of relativity. The first paper in this field was published by [1], but his work was virtually forgotten until 1964, when [2] gave the mathematical theory of gravitational focusing by a galaxy located between the Earth and a very distant cosmological object, such as a quasar.
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References
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(2009). So much gain at 550 AU. In: Deep Space Flight and Communications. Springer Praxis Books. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-72943-3_1
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