Names
* Birthdays are the most common type of anniversary, on which someone's birthdate is commemorated each year. The actual celebration is sometimes moved for practical reasons, as in the case of an official birthday or one falling on February 29. * Wedding anniversaries are also often celebrated, on the same day of the year as the wedding occurred. * Death anniversaries. TheNumerical
Latin terms for anniversaries are mostly straightforward, particularly those relating to the first thirty years (1–30), or multiples of ten years (30, 40, 50, 60, 70 etc.), or multiples of centuries or millenniums (100, 200, 300, 1000, 2000, 3000, etc.) In these instances, the name of the anniversary is generally derived from the Latin word(s) for the respective number of years. When anniversaries relate to fractions of centuries (125, 150, 175, 225 years—i.e. 1.25, 1.5, 1.75, and 2.25 centuries), the situation is not as simple. Roman fractions were based on a duodecimal system. From to they were expressed as multiples of twelfths ('' uncia'' "twelfth"; the source of the English words ''inch'' and ''ounce'') and from to they were expressed as multiple twelfths less than the next whole unit—i.e. a whole unit less , or respectively. There were also special terms for quarter ('' quadrans''), half ('' semis''), and three-quarters ('' dodrans''). '' Dodrans'' is a Latin contraction of ''de-quadrans'' which means "a whole unit less a quarter" (''de'' means "from"; ''quadrans'' means "quarter"). Thus for the example of 175 years, the term is a quarter century less than the next whole (bi)century or 175 = (−25 + 200). In Latin, it seems that this rule did not apply precisely for . While ''secundus'' is Latin for "second", and ''bis'' for "twice", these terms are not used such as in sesqui-secundus. Instead ''sesqui'' (or ''ses'') is used by itself.Symbols
Many anniversaries have special names. ''Etiquette in Society, in Business, in Politics and at Home'' by Emily Post, published in 1922, contained suggestions for wedding anniversary gifts for 1, 5, 10, 15, 20, 25, 50, and 75 years. Wedding anniversary gift suggestions for other years were added in later editions and publications; they now comprise what is referred to as the "traditional" list. Generally speaking, the longer the period, the more precious or durable the material associated with it. There are variations according to some national traditions. There exist numerous partially overlapping, partially contradictory lists of anniversary gifts (such as wedding stones), separate from the 'traditional' names. The concepts of a person's birthday stone and zodiac stone, by contrast, are fixed for life according to the day of the week, month, or astrological sign corresponding to the recipient's birthday.See also
* List of historical anniversaries * Quinquennial Neronia *References
External links
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