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B.C. 163 May 20; B.C. 87 Aug. 15 B.C. 240 May 15; B.C. 163 May 20
The date B.C. 240 May 15 was deduced from observation, not from calculation. The date calculated is B.C. 239 Jan. suppose an error of two months in the same direction in each of the calculations of the last two revolutions (which is quite probable), the discordance would almost disappear. It appears worth while to calculate the three revolutions B.C. 12 to B.C. 240 by more exact methods, and we hope to undertake this at a later date.
The following table gives the values of n calculated from the above results for the different revolutions, and also smoothed values resulting from the combination of values from consecutive revolutions.
Diagram showing the positions of Jupiter's Satellites VI, VII, and VIII, from photographs taken at the Royal Observatory. Greenwich, during the Opposition of 1907 8.