Isophotometric measurements have been made on films, taken during the transit of Mercury, on May 9, 1970. This note gives the isophotes of Mercury in front of the sun in white light and some results of the comparison between the intensity of the sunspot's umbra and Mercury in H-alpha and white light.
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Dizer, M., Yazici, M.N. Isophotometric measurements of Mercury. Astrophys Space Sci 13, 106–109 (1971). https://doi.org/10.1007/BF00656316
- White Light