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Memorial plaque presented by the National Capital Sesquicentennial Commission in Washington, D.C., in 1951. An anniversary is the date on which an event took place or an institution was founded in a previous year, and may also refer to the commemoration or celebration of that event.
Jubilee. A Jubilee is often used to refer to the celebration of a particular anniversary of an event, usually denoting the 25th, 40th, 50th, 60th, and the 70th anniversary. The term comes from the Hebrew bible, initially concerning a recurring religious observance involving a set number of years, that notably involved freeing of debt slaves.
See calendar and list of calendars for other groupings of years. See history , history by period , and periodization for different organizations of historical events. For earlier time periods, see Timeline of the Big Bang , Geologic time scale , Timeline of evolution , and Logarithmic timeline .
United States Semiquincentennial. The United States Semiquincentennial, [a] also called the Bisesquincentennial, the Sestercentennial or the Quarter Millennial, will be the 250th anniversary of the 1776 United States Declaration of Independence. Festivities will be scheduled to mark various events leading up to the anniversary on July 4, 2026.
About 31.7 years. jubilee: 50 yr: century: 100 yr: millennium: 1000 yr: Also called "kiloannum". Age: 2,148 and two thirds of a year: a unit used in astrology, each of them represent a star sign terasecond: 10 12 s: About 31,709 years. megaannum: 10 6 yr: Also called "Megayear." 1,000 millennia (plural of millennium), or 1 million years (in ...
Wedding anniversary. A wedding anniversary is the anniversary of the date that a wedding took place. Couples often mark the occasion by celebrating their relationship, either privately or with a larger party. Special celebrations and gifts are often given for particular anniversary milestones (e.g., 10, 15, 20, or 25 years).
A 50-year "pocket calendar" that is adjusted by turning the dial to place the name of the month under the current year. One can then deduce the day of the week or the date. A perpetual calendar is a calendar valid for many years, usually designed to look up the day of the week for a given date in the past or future.
The categorisation of the past into discrete, quantified named blocks of time is called periodization. [1] This is a list of such named time periods as defined in various fields of study. These can be divided broadly into prehistorical periods and historical periods (when written records began to be kept).