The Ancient Astronomy of Easter Island: Kirch's Comet
  A fragment of the folklore text "Apai" that was once put down on Easter Island contains a report about astronomical observations of Kirch's Comet or the Great Comet of 1680-1681 A.D. (C/1680 V1) and the partial solar eclipse of March 19, 1681 A.D. Some astronomical aspects of the local cult of bird-men have been discussed, too. 
Sergei Rjabchikov
physics.hist-ph