Rectified Hebrew calendar
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The Rectified Hebrew calendar is a proposal for calendar reform by Dr. Irv Bromberg of the University of Toronto. It is a lunisolar calendar intended to replace the traditional fixed arithmetic Hebrew Calendar. The months are the same length but the main difference is that it has 130 leap years per 353-year cycle (4366 lunar months), rather than the traditional 7 leap years per 19-year cycle (235 lunar months).
It is a leap year if the remainder of (Year × 130 + 268)/353 is less than 130.
The Rectified Hebrew Calendar employs a progressively shorter length for the molad interval, corresponding to the actual length of the mean lunations, referred to the meridian of Jerusalem. At 1 Tishrei 5766 (fall 2005) each lunation had 29.5305876666475 days and was getting progressively shorter by 27⅓ microseconds per lunation; the average calendar year had 365.24239242445 days and was getting progressively shorter by about 3/2 second per 353-year cycle.
