Fig. 3
1:6 (top) and 2:13 (bottom) resonant arguments for 1P/Halley based on integrations of the nominal orbit using the orbital solutions of Yeomans & Kiang (1981). The comet is in the resonance during times when the resonant argument librates, as opposed to when it circulates. The time period when the orbit is less constrained, prior to 1404 BCE, is shown in gray.
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