Abstract
THE author of the article on the sixth satellite of Jupiter in NATURE of January 19 has obviously made a slip in assuming that the “retrograde” motion ascribed to the satellite means retrograde in the sky, and not in the orbit. According to the ephemeris, Jupiter on January 4 was moving direct, i.e. eastward, about 225″ daily. The satellite was west of the planet (position angle 269°), approaching Jupiter at the rate of 45″ a day, and, therefore, moving eastward (direct) about 270″ daily.
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YOUNG, C. The Sixth Satellite of Jupiter. Nature 71, 365 (1905). https://doi.org/10.1038/071365a0
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DOI: https://doi.org/10.1038/071365a0
