login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A100748 Years of recorded appearances of Halley's Comet (negative years are B.C.). 1

%I

%S -240,-164,-86,-11,66,141,218,295,374,451,530,607,684,760,837,912,989,

%T 1066,1145,1222,1301,1378,1456,1531,1607,1682,1759,1835,1910,1985

%N Years of recorded appearances of Halley's Comet (negative years are B.C.).

%C 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_, Jun 24 2007

%H Joseph M. Laufer, <a href="http://www.lauferworld.com/haleyhome.html">Halley's Comet, Its 30th Recorded Return, 1985-1986</a>.

%e a(30) = 1985 because the 30th recorded appearance of Halley's comet was in 1985.

%Y See A072235 for another version.

%K sign

%O 1,1

%A _David Terr_, Jan 03 2005

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 30 16:32 EST 2023. Contains 359945 sequences. (Running on oeis4.)