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It more often refers in particular to the day when the Sun is exactly at the celestial longitude of 210°. In the Gregorian calendar , it usually begins around October 23 and ends around November 7. The western holiday of Halloween occurs in this solar term.
First frost dates are based on historical averages, but of course, weather is unpredictable. It's estimated that a frost may occur earlier than the given date 30% of the time.
Like all FRC months, Frimaire lasted 30 days and was divided into three 10-day weeks called décades (decades). Every day had the name of an agricultural plant, except the 5th (Quintidi) and 10th day (Decadi) of every decade, which had the name of a domestic animal (Quintidi) or an agricultural tool (Decadi).
The modern definition using ecliptic longitudes, introduced by the Shixian calendar, is known as 定气法 (dìng qì fǎ, ' steady term method '). Under this method, the determination of solar terms is similar to the astronomical determination of the special cases of equinox and solstice dates, with different ecliptic longitudes to solve for.
Because evening out the lengths of the months is part of the rationale for reforming the calendar, some reform calendars, such as the World Calendar and the Hanke–Henry Permanent Calendar, contain a 30-day February. The Symmetry454 calendar assigns 35 days to February, May, August, and November, as well as December in a leap year.
A calendar date is a reference to a particular day represented within a calendar system. The calendar date allows the specific day to be identified. The number of days between two dates may be calculated. For example, "25 January 2025" is ten days after "15 January 2025". The date of a particular event depends on the observed time zone.
Many mainland European countries tended to recognize Martinmas or St. Martin's Day (11 November) as the first calendar day of winter. [25] The day falls at the midpoint between the old Julian equinox and solstice dates. Also, Valentine's Day (14 February) is recognized by some countries as heralding the first rites of spring, such as flowers ...
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