Abstract
BLACK TRANSIT OF JUPITER'S FOURTH SATELLITE.—The fourth satellite of Jupiter was observed in black transit by Mr. E. E. Barnard of Nashville, Tenn., U.S.A., on May 8 with a 6-inch refractor. It was first noticed as a black spot at ph. 20m. local mean time. Some little time previous to this it had been looked for on the disk but could not be seen either as a white or dark spot. The satellite was followed until 9h. 43m., and was then very black and rather small and round when best seen.
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Our Astronomical Column . Nature 34, 202–203 (1886). https://doi.org/10.1038/034202a0
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DOI: https://doi.org/10.1038/034202a0