to perihelion might be looked for about the middle of the 19th century, 1848 to 1850. This prediction failed, and as of 2009 no observed comet has matched the orbital elements of either comet. David A. Sargent writes that available evidence points to there being no connection between the comets of 1264 and 1556. References Notes Non-periodic comets 1556 in science 15560227 Great comets