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・ Half Way Home (album)
・ Half Way House (Chatham, Massachusetts)
・ Half Way to Heaven
・ Half Way to Hell Club
・ Half Way Tree
・ Half Way Up
・ Half Way, California
・ Half Way, West Virginia
・ Half Wild
・ Half Yellow Face
・ Half-A-Dollar-Bill
・ Half-Alive
・ Half-arch (crown)
・ Half-back line
・ Half-band filter
Half-birthday
・ Half-Blood Blues
・ Half-Blood Prince (disambiguation)
・ Half-Breed
・ Half-breed
・ Half-Breed (album)
・ Half-Breed (politics)
・ Half-Breed (short story)
・ Half-Breed (song)
・ Half-Breed Tract
・ Half-Breeds on Venus
・ Half-Broken Things
・ Half-carry flag
・ Half-caste
・ Half-Caste (film)


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Half-birthday : ウィキペディア英語版
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 falls near major holidays, the celebration of which may overshadow celebration of the birthday.〔(Betty Crocker Half Birthday party menus )〕 It may also be marked by students whose birthday does not occur during the regular school year; a half-birthday allows a celebration with friends at school.〔(Metro-Parent: "Top Reasons to Celebrate Your Child's Half Birthday" )〕
== Calculation ==
There are two ways to calculate half-birthdays.
The easier but potentially less precise method is to take the number of the date of the birthday and advance the month by six, e.g. December 5 becomes June 5. Because not all months have the same number of days, this doesn't always work – for example, six months after an August 30 birthday would be February 30, which doesn't exist in the Gregorian calendar.
The more precise method is to add or subtract half the number of days in a year to the birth date. In the case of a common year, this would be 182.5 days. In leap years, the number of days would be 183. This method would lead to a March 1 or February 29 half-birthday for an August 30 birthday, depending on whether it's a leap year.〔(Half birthday calculator )〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Half-birthday」の詳細全文を読む



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