<P> This rule gives an average year length of 365.242222 days . This is a very good approximation to the mean tropical year, but because the vernal equinox year is slightly longer, the Revised Julian calendar for the time being does not do as good a job as the Gregorian calendar at keeping the vernal equinox on or close to March 21 . </P> <P> The Chinese calendar is lunisolar, so a leap year has an extra month, often called an embolismic month after the Greek word for it . In the Chinese calendar the leap month is added according to a rule which ensures that month 11 is always the month that contains the northern winter solstice . The intercalary month takes the same number as the preceding month; for example, if it follows the second month (二 月) then it is simply called "leap second month" i.e. simplified Chinese: 闰 二 月; traditional Chinese: 閏 二 月; pinyin: rùn'èryuè . </P> <P> The Hebrew calendar is lunisolar with an embolismic month . This extra month is called Adar Alef (first Adar) and is added before Adar, which then becomes Adar Bet (second Adar). According to the Metonic cycle, this is done seven times every nineteen years (specifically, in years 3, 6, 8, 11, 14, 17, and 19). This is to ensure that Passover (Pesah) is always in the spring as required by the Torah (Pentateuch) in many verses relating to Passover . </P> <P> In addition, the Hebrew calendar has postponement rules that postpone the start of the year by one or two days . These postponement rules reduce the number of different combinations of year length and starting days of the week from 28 to 14, and regulate the location of certain religious holidays in relation to the Sabbath . In particular, the first day of the Hebrew year can never be Sunday, Wednesday or Friday . This rule is known in Hebrew as "lo adu rosh" (לא אד "ו ראש), i.e., "Rosh (ha - Shanah, first day of the year) is not Sunday, Wednesday or Friday" (as the Hebrew word adu is written by three Hebrew letters signifying Sunday, Wednesday and Friday). Accordingly, the first day of Passover is never Monday, Wednesday or Friday . This rule is known in Hebrew as "lo badu Pesah" (לא בד "ו פסח), which has a double meaning--"Passover is not a legend", but also "Passover is not Monday, Wednesday or Friday" (as the Hebrew word badu is written by three Hebrew letters signifying Monday, Wednesday and Friday). </P>

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