大彗星
Some astronomers speculated that the Great Comet of 1556 and the Great comet of 1264 are the same comet. Alexandre Guy Pingré, who in his "Cométographie" (1783) calls the Great comet of 1264 a "great and celebrated comet", calculated the comet's parabolic orbit, which he found bore great resemblance to that of the comet of 1556. The comet of 1264, says Pingré, "is very probably the same as that of 1556; its periodical revolution is about 292 years; and its return may consequently be expected about 1848."