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J J1 —Smaller lunar elliptic diurnal constituent. This constituent, with M1, modulates the amplitudes of the declinational K1, for the effect of the Moon's elliptical orbit. Speed = T + s + h - p = 15.585,443,3° per solar hour.Japan Current—Same as Kuroshio. Julian calendar—A calendar introduced by Julius Caesar in the year 45 B.C., and slightly modified by Augustus a few years later. This calendar provided that the common year should consist of 365 days and that every fourth year, now known as a bissextile or leap year, should contain 366 days, making the average length of the year 365.25 days. It differs from the modern or Gregorian calendar in having every fourth year a leap year, while in the modern calendar century years not divisible by 400 are common years. See Gregorian calendar. Julian date—Technique for the identification of successive days of the year when monthly notation is not desired. This is especially applicable in computer data processing and acquisition where indexing is necessary. |