今天，2009年9月9日，恋人们争相到民政局注册结婚；电影发行方热力推出新片首映；商家也应景地推出特别促销活动。这是为什么呢？首先，09/09/09是我们在本世纪看到的最后一个年月日数字都相同的日期，下一次将是2101年1月1日。其次，数字明理学家认为从1到9每个数字都有其独特的意义，不同的数字组合会在生活中产生明显不同的影响。作为数字序列中的最后一个数字，9代表宽仁、同情及成功等积极的特质，同时也有傲慢、自负等不太好的意义。古希腊哲学家、数学家毕达哥拉斯也认为9这个数字有很多独有的特性。例如：9与任意个位数相乘得到的两位数，这个两位数的两个数字相加的结果肯定是9，如，9×3＝27，2＋7＝9。此外，9在中国一直都是“长久”的代表数字，09/09/09这个日期对很多人来说都预示着“长长久久”之意。不过，在日本，9代表的却是苦难，人们在生活中都会避免使用这个数字。

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Though technically there's nothing special about the symmetrical date, some concerned with the history and meaning of numbers ascribe powerful significance to 09/09/09.

Everyone from brides and grooms² to movie studio execs are celebrating the upcoming calendrical anomaly in their own way.

In Florida, at least one county clerk's office is offering a one-day wedding special for $99.99. The rarity of this Sept. 9 hasn't been lost on the creators of the iPod, who have moved their traditional Tuesday release day to Wednesday to take advantage of the special date. Focus Features is releasing their new film "9," an animated³ tale about the apocalypse, on the 9th.

Not only does the date look good in marketing⁴ promotions⁵, but it also represents the last set of repeating, single-digit dates that we'll see for almost a century (until January 1, 2101), or a millennium⁶ (mark your calendars for January 1, 3001), depending on how you want to count it.

Though technically there's nothing special about the symmetrical date, some concerned with the history and meaning of numbers ascribe powerful significance to 09/09/09.

For cultures in which the number nine is lucky, Sept. 9 is anticipated - while others might see the date as an ominous⁷ warning.

Math magic

Modern numerologists - who operate outside the realm of real science - believe that mystical significance or vibrations⁸ can be assigned to each numeral one through nine, and different combinations of the digits⁹ produce tangible¹⁰ results in life depending on their application.

As the final numeral, the number nine holds special rank. It is associated with forgiveness, compassion¹¹ and success on the positive side as well as arrogance¹² and self-righteousness on the negative, according to numerologists.

Though usually discredited¹³ as bogus, numerologists do have a famous predecessor¹⁴ to look to. Pythagoras, the Greek mathematician¹⁵ and father of the famous theorem, is also credited with popularizing numerology in ancient times.

"Pythagoras most of all seems to have honored and advanced the study concerned with numbers, having taken it away from the use of merchants and likening all things to numbers," wrote Aristoxenus, an ancient Greek historian, in the 4th century B.C.

As part of his obsession¹⁶ with numbers both mathematically and divine, and like many mathematicians¹⁷ before and since, Pythagoras noted¹⁸ that nine in particular had many unique properties.

Any grade-schooler could tell you, for example, that the sum of the two-digits resulting from nine multiplied by any other single-digit number will equal nine. So 9x3=27, and 2+7=9.

Multiply nine by any two, three or four-digit number and the sums of those will also break down to nine. For example: 9x62 = 558; 5+5+8=18; 1+8=9.

Sept. 9 also happens to be the 252nd day of the year (2 + 5 +2)...

Loving 9

Both China and Japan have strong feelings about the number nine. Those feelings just happen to be on opposite ends of the spectrum¹⁹.

The Chinese pulled out all the stops to celebrate their lucky number eight during last year's Summer Olympics, ringing the games in at 8 p.m. on 08/08/08. What many might not realize is that nine comes in second on their list of auspicious²⁰ digits and is associated with long life, due to how similar its pronunciation is to the local word for long-lasting (eight sounds like wealth).

Historically, ancient Chinese emperors associated themselves closely with the number nine, which appeared prominently in architecture and royal dress, often in the form of nine fearsome dragons. The imperial dynasties were so convinced of the power of the number nine that the palace complex at Beijing's Forbidden City is rumored²¹ to have been built with 9,999 rooms.

Japanese emperors would have never worn a robe with nine dragons, however.

In Japanese, the word for nine is a homophone for the word for suffering, so the number is considered highly unlucky - second only to four, which sounds like death.

Many Japanese will go so far as to avoid room numbers including nine at hotels or hospitals, if the building planners haven't already eliminated them altogether.