1492 light sighting
The 1492 light sighting was a sighting of unknown light during the first voyage of Christopher Columbus on October 11, 1492, by some crew members of Santa Maria, Pinta and possibly Niña shortly before the landing on Guanahani. The light was reported in Columbus' journal, Ferdinand Columbus' Vita del Ammiraglio (The Life of the Admiral), the proceedings of the Pleitos Colombinos (the long lawsuit involving the heirs of Columbus) and some other sources.
Columbus described the light as "a small wax candle that rose and lifted up, which to few seemed to be an indication of land". He received the royal reward for the sighting. His son Ferdinand also characterized it as a candle, that went up and down.
Bartolomé de las Casas noted the event in his abstract of Columbus's log: "A sailor named Rodrigo de Triana saw this land first, although the Admiral, at the tenth hour of the night, while he was on the sterncastle saw a light, although it was something so faint that he did not wish to affirm that it was land. But he called Pero Gutierrez, the steward of the king's dais, and told him that there seemed to be a light, and for him to look: and thus he did and saw it".
It was calculated that the twelve leagues, that the crew ran since 10 p.m., with the two leagues distance off the land, essentially correspond to the distance and location of Watling's Island from Guanahani. As such, it was presumed that the light was on Watling's Island, which was passed by Columbus. Judging by the speed of the ships, provided in naval journal, L. T. Gould supposed that the light "must have been some 35 miles or so eastward of the landfall, and well to windward of it".
Proposed explanations 
Artificial origin 
An early explanation was offered by Bartolomé de las Casas, who wrote: "I feel about this is that the Indians at night throughout these islands, as they are temperate without any cold, go out or used to go out from their straw houses that they call bohios at night to comply with their natural necessities and take in hand a firebrand, or small torch, or a chink of pine or of another very dry and resinous wood which burns like a torch, when it is dark night, and with which they guide themselves back again, and in the manner could be seen the light which Christopher Columbus and the others saw the light three or four times". This version was supported by Morison, despite the fact that it tended to undermine his preferred landfall at Watlings Island (San Salvador). Others have advanced the hypothesis that the light might have been an Indian fishing in a canoe at night, but the very high winds imply that would have been quite unlikely.
It has been proposed that the light was caused by bioluminescent protozoa on the rocks of Mouchoir Bank. However this theory is rendered improbable due to the "small wax candle" nature of the light, which suggests a point source. A single female Bermuda fireworm Odontosyllis enopla may have separate short periods of excessive and minor brilliance, perhaps accounting for a candle-like display. But later research has shown that Odontosyllis bioluminescent activity is confined to a few days past the full moon, which would rule out that explanation, as the Moon was near first quarter that night.
- "Columbus: The Light of 11 October, 1492". The Islands' Sun. March/April 1990. Archived from the original on September 07, 2008. Retrieved 2010-05-24.
- "Christopher Columbus, Journal (1492)". Swarthmore College. Retrieved 2010-05-24.
- Washington Irving. The life and voyages of Christopher Columbus: together with the voyages of his companions, Volume 3, Murray, 1849, p. 369
- Christopher Columbus, Sir Clement Robert Markham. The journal of Christopher Columbus: (during his first voyage, 1492-93), Ayer Publishing, 1972, p. 36
- "Landfall of Columbus", The Geographical Journal, May 1927
- Samuel Eliot Morison. Admiral of the Ocean Sea - A Life of Christopher Columbus, READ BOOKS, 2007, p. 225
- Pickering, Keith A. (1994). Columbus's Plana Landfall. Dio 4:1, 14-23
- "The Light of October 11". Columbus Navigation. Retrieved 2010-05-24.
- Crawshay, L.R. (1935). Possible bearing of a luminous syllid on the question of the landfall of Columbus. Nature 136:559-560.
- Gaston, Gary, and Jennifer Hall (2000). Lunar periodicity and bioluminescence of swarming Odonotsyllis luminosa (Polychaeta:syllidae) in Belize. Gulf and Caribbean Research 12:47-51.