Abstract
DR. HILL'S CUSPED ORBIT.—Dr. Hill in his “Researches on the Lunar Theory” described a certain case of satellite motion in which the orbit of the satellite relatively to the primary was cusped at first and last quarter. The period of such a satellite in the earth's case would be 205 days. Dr. Hill supposed that this was the orbit of maximum lunation, but M. Henri Poincare1 later showed that still larger orbits were possible, with loops replacing the cusps.
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Our Astronomical Column. Nature 107, 503 (1921). https://doi.org/10.1038/107503a0
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DOI: https://doi.org/10.1038/107503a0