Solar Cycle
in chronology, a term applied to one of those artificial periods made use of in chronological researches.
It comprehends a period of 28 years, compounded of 7 and 4, the number of days in a week, and the number of years in the SOLAR SYSTEM interval of two leap years. This cycle remained undisturbed till the end of the 19th century; but in consequence of the year 1900 not being reckoned as a leap year, the whole cycle was then overthrown. It may, however, be reconstructed after 2000, that year being reckoned as leap year; it will then last till 2100.