Editing Moveable feast (section)

==In other religions==
The [[Roman calendar]] possessed a number of moveable feasts ({{lang|la|[[feriae conceptivae]]}}, "proclaimed festivals") like the [[Sementivae|Sementivae or Paganalia]] honoring [[Ceres (goddess)|Ceres]] and [[Tellus (goddess)|Tellus]] that varied to allow them to occur in the proper season and conditions. [[Agnes Kirsopp Lake Michels|Michels]] has argued that such moveable feasts were probably universal before the adoption of the lunar-based [[nundinal cycle]], the earliest Italian calendars most likely being [[observational calendars|observational]] and based on natural cycles like [[vernation]] and [[Roman agriculture|ripening]].<ref>{{citation |last=Michels |first=Agnes Kirsopp Lake |author-link=Agnes Kirsopp Lake Michels |contribution=The 'Calendar of Numa' and the Pre-Julian Calendar |title=Transactions & Proceedings of the APA |volume=80 |location=Philadelphia |publisher=American Philological Association |pages=320–346 |date=1949 }}.<!--p. 331--></ref>

The traditional [[Chinese calendar]] is [[lunisolar calendar|lunisolar]], as are others in [[East Asia]] based on it. This causes the timing of the [[Chinese New Year]], the [[Mid-Autumn Festival]], and [[List of observances set by the Chinese calendar|several other holidays]]{{mdash}}all traditionally associated with various [[Chinese folk religion|rituals and offerings]]{{mdash}}to vary within the Gregorian calendar, usually within a space of two months. 

In [[Judaism]], [[Jewish holidays|all holidays]] fixed to the lunisolar [[Jewish calendar|traditional calendar]] move relative to the Gregorian calendar, again usually within a space of two months. In addition, there are two observances that are moveable within both systems, being based on the Shmuelian tekufot approximations of the equinoxes and solstices established by [[Samuel of Nehardea]]. Samuel fixed them to the [[Julian calendar]], which slowly slips out of alignment with the Gregorian over a span of several centuries. The first is the annual commencement of the ''sh'elah'' period during which [[Jewish diaspora|diaspora Jews]] add a petition for rain to their [[Jewish prayer|daily prayers]], which occurs on 23 November (Julian) in most years and on 24 November (Julian) when the following year will be a Julian [[leap year]]. The second is the [[Birkat Hachama]] ("Blessing of the Sun"), a ceremony performed once every 28 years, which always occurs on Wednesday, 26 March (Julian), in a Julian year of the form 28n+21.{{cn|date=March 2022}}

In [[Islam]], [[Islamic holidays|all holidays]] fixed to the [[lunar calendar|lunar]] [[Islamic calendar]] vary completely within the Gregorian calendar, shifting by 10 or 11 days each year and moving through the entire Gregorian year over the course of about 33 years (making 34 Islamic years).