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  2. Half-birthday - Wikipedia

    en.wikipedia.org/wiki/Half-birthday

    A half-birthday is a day approximately six months before or after the anniversary of a person's birth. It is sometimes marked by people whose birthday either falls on major holidays, near major holidays, or both, the celebration of which may overshadow celebration of the birthday. [1] It may also be marked by students whose birthday does not ...

  3. Leap year - Wikipedia

    en.wikipedia.org/wiki/Leap_year

    Leap year. A leap year (also known as an intercalary year or bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) compared to a common year. The 366th day (or 13th month) is added to keep the calendar year synchronised with the astronomical year or seasonal year. [ 1]

  4. Birthday problem - Wikipedia

    en.wikipedia.org/wiki/Birthday_problem

    The equation expresses the fact that the first person has no one to share a birthday, the second person cannot have the same birthday as the first (⁠ 364 / 365 ⁠), the third cannot have the same birthday as either of the first two (⁠ 363 / 365 ⁠), and in general the n th birthday cannot be the same as any of the n − 1 preceding birthdays.

  5. Category:Date of birth unknown - Wikipedia

    en.wikipedia.org/wiki/Category:Date_of_birth_unknown

    This category (and within its own specific purpose, the analogous Category:Date of death unknown) is intended for placement in biographical entries about deceased individuals, primarily from antiquity (although, in some cases, reaching into the 19th century), whose year of birth is indicated, but the month and day are lost to history and never likely to be known.

  6. Trump turns 78, a birthday he says he’d like to pretend ...

    www.aol.com/news/trump-turns-78-birthday-wishes...

    “You just want to pretend the day doesn’t exist.” The day does exist, and it was Friday. Trump is now 78 years old. It’s an age that has clearly occupied space in Trump’s mind for some time.

  7. Talk:Half-birthday - Wikipedia

    en.wikipedia.org/wiki/Talk:Half-birthday

    I believe this is meant to say that for these birthdays, the half-birthday will not be the same numerical day of the month (e.g., the half-birthday of March 31 is Sept. 1), which doesn't seem worth mentioning. - DavidWBrooks 14:03, 7 January 2006 (UTC) I always thought that the half-birthday was the same day of the month.

  8. Twin paradox - Wikipedia

    en.wikipedia.org/wiki/Twin_paradox

    One year later, the ship is back home and the clock shows 6 years. So, during the trip back, both twins see their sibling's clock going 3 times faster than their own. Factoring out the fact that the light-time-delay is decreasing by 0.8 seconds every second, each twin calculates that the other twin is aging at 60% his own aging speed.

  9. Birthday customs and celebrations - Wikipedia

    en.wikipedia.org/wiki/Birthday_customs_and...

    A child's birthday party may be held at the family's home or in a public place. Soft drinks are often had alongside water and both sweet and savory foods are typically served to the guests. In many cultures, a birthday cake is served. Birthday parties for children often feature entertainment, costumes, party games, and a theme.