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A100748
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Years of recorded appearances of Halley's Comet (negative years are B.C.).
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1
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-240, -164, -86, -11, 66, 141, 218, 295, 374, 451, 530, 607, 684, 760, 837, 912, 989, 1066, 1145, 1222, 1301, 1378, 1456, 1531, 1607, 1682, 1759, 1835, 1910, 1985
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| This sequence is not well-defined for many reasons (negative years are ill-defined; calendars change often, so when does a year begin?; what does "observed" mean?; what if the comet was observed both at the end of one year and at the beginning of another, as in 1985/1986?; etc.). - N. J. A. Sloane (njas(AT)research.att.com), Jun 24 2007
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LINKS
| Joseph M. Laufer, Halley's Comet, Its 30th Recorded Return, 1985-1986.
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EXAMPLE
| a(30) = 1985 because the 30th recorded appearance of Halley's comet was in 1985.
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CROSSREFS
| See A072235 for another version.
Sequence in context: A072173 A015161 A078151 * A072235 A121378 A191533
Adjacent sequences: A100745 A100746 A100747 * A100749 A100750 A100751
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KEYWORD
| sign
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AUTHOR
| David C. Terr (David_C_Terr(AT)raytheon.com), Jan 03 2005
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