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Half-Age Day

Half-Age Day
  • #: 14467
  • Price: free ($0.00) In Apple Store
  • Category: Entertainment
  • Updated: 2009-12-30
  • Current Version: 1.1
  • 1.1
  • Size: 0.60 MB
  • Language: English
  • Seller: The Xylem LLC
  • Requirements: Compatible with iPhone, iPod touch, and iPad. Requires iOS 3.0 or later
  • © 2009 The Xylem LLC.
  •  Add to Favorite apps

 

Description

Think of someone. Anyone. Did you know that there exists a date where you were/will be exactly half of that person's age, or they were/will be exactly half of your age? This is true for any two people. It only happens once... it happens on their Half-Age day.

The Half-Age Day application quickly calculates that day given two birthdays.

What is your half-age day with your mom?

What is your half-age day with your son?

Your brother?

With Elvis?

Robert Pattenson?

Abe Lincoln?

Jesus?

You have that ONE INSTANCE IN TIME that truly and uniquely belongs to just you two. If you missed the day, or it's 100 years away, just meet on the anniversary (or pre-anniversary).

Split something delicious on this day, such that the younger person gets half as much as the elder. If one of you is no longer around, symbolically throw his or her part to the wind. Shed a tear, if needed, but don't litter.

This is formally stated in the Half Age Instance (HAI) Existence Theorem, more commonly known as Cherney's Theorem, developed in 2005 by University of Michigan student Alan Cherney.

Cherney's Theorem:

For any two individuals (x and y) there exists a unique time (t), such that if it is time t, x is exactly half the age of y, or y is exactly half the age of x. If it is not time t, x is not exactly half the age of y, and y is not exactly half the age of x.

(This theorem is a sub-thereom of Cherney's Non-negative Constant Product Age Instance theorem. NCPAI is generally verbatim to HAI, however, shows this is true for more than just than .5, but rather, any non-negative constant multiplier.)

Example of Cherney's Theorem:

This calculation takes two inputs (dates) to demonstrate Cherney's Theorem.

Billy's birthday is August 12, 1982,

His dad's birthday is September 24, 1953

Their Half-Age day is June 30th, 2011, where Billy will be 29, and his dad will be 58.

At no other time will Billy be half the age of his dad, and Billy's dad will (of course) never be half the age of Billy.

Because of its uniqueness, this date should be held in high esteem, next to the date of a wedding, or the day someone is born! Unfortunately, toward the adult years, we have already missed this date with our peers. Also, if the two people are extremely different in age (eg. a newborn and his grandmother), their HAI is most likely to be after the death of the elder. In an even larger difference, it will likely be after the death of both people. However, most parents (especially new parents) have this date to look forward to with each of their children, and for many siblings, it has yet to occur!

Have I gone over this enough? It's cool, it's fun, it's free! Try it!

What's New in Version 1.1

Quick presets
Saves default birthday
GUI Improvements

iPhone Screenshots

Half-Age Day iPhone Screenshot 1

Video Reviews

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Rated 4/5 based on 2 customer reviews.

 

4/5 stars

It's a cool idea

:
My only complaint is that it says the ages (days) of the people are wrong. I cannot find anywhere to change or check the internal clock.

5/5 stars

Accurate!

:
I just tried it for several tests, and the age in days IS accurate! Don't believe anyone who says otherwise. Try it for yourself! It's free! (Plus, it's a fairly easy math problem to test accuracy if you don't believe me.)

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The information may be outdated (2011-03-27 17:29:01). For actual information go to iTunes

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