Comet vintages are years during which an astronomical event, involving generally a "Great Comet", occurs prior to harvest. Throughout the history of wine, winemakers have attributed successful vintages and ideal weather conditions to the unexplained effects caused by the comets. Some of the most heralded vintages in the last couple of centuries—such as the 1811, 1826, 1839, 1845, 1852, 1858, 1861, 1985 & 1989 vintages—have coincided with a notable appearance of a comet. The term "comet wine" is sometimes used in the wine world to describe a wine of exceptional quality in reference to the high reputation that comet vintages have. The 1811 comet vintage, coinciding with the appearance of the Great Comet of 1811, is perhaps the most famous. The 1811 Château d'Yquem has exhibited what wine exp