Dirk Brouwer, namesake of the AAS Division of Dynamical Astronomy's Dirk Brouwer Career Award, describes how errors compound when numerically integrating planetary orbits.
Read MoreKiyotsugu Hirayama publishes observations of asteroids with unusually closely spaced orbits, kick-starting the study of asteroid families.
Read MoreAsaph Hall III, the discoverer of Mars's moons Phobos and Deimos, notes the anomalous precession of Mercury's orbit and calls into question Newtonian gravity.
Read MoreThe fifth known moon of Jupiter, today called Amalthea, is discovered.
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