We have used radio interferometry to measure the deflection of a radio source as it passed the sun. This deflection is a separable combination of refraction in the coronal electron plasma and the general relativistic effect. The observed deflection was 1.04_-0.10+0.15 times that predicted by Einstein's theory of general relativity. The observation also yielded a reasonable value for the coronal electron density.
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Muhleman et al. (1970) studied this question.
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