Today is September, 9, 2009 or 9/9/09

  • Thread starter Thread starter Jimmy Snyder
  • Start date Start date
Click For Summary

Discussion Overview

The discussion revolves around the significance of the date September 9, 2009 (9/9/09) and the properties of the number nine. Participants share trivia, mathematical properties, and personal anecdotes related to the date and the number, exploring both its cultural and numerical significance.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants highlight various interesting properties of the number nine, such as its status as the largest single-digit number and its mathematical relationships (e.g., 9 is the sum of pairs of numbers that equal 9).
  • Others mention the cultural significance of the date 9/9/09, noting that it could have been more interesting if it were 9/9/9 without the year zero.
  • Several participants share personal anecdotes related to the date, including celebrations and missed opportunities to celebrate similar dates in the past.
  • Some participants express skepticism about the significance of 9/9/2009, suggesting that it lacks importance compared to other dates.
  • There are mentions of other notable dates like 10/10/10 and 11/11/11, with some participants sharing their own birth dates and celebrations tied to these numbers.
  • Participants also discuss the mathematical properties of nine, including its representation in different bases and its occurrence in various mathematical contexts.

Areas of Agreement / Disagreement

Participants generally agree on the interesting properties of the number nine, but there are competing views regarding the significance of the date 9/9/09. Some find it noteworthy, while others dismiss it as trivial.

Contextual Notes

Some claims about the properties of nine depend on specific mathematical definitions and may not be universally accepted. Additionally, the significance of the date may vary based on personal perspectives and cultural contexts.

Who May Find This Useful

This discussion may be of interest to those who enjoy mathematics, number theory, or cultural trivia, as well as individuals looking for fun facts or personal anecdotes related to significant dates.

Jimmy Snyder
Messages
1,122
Reaction score
21
Today is September, 9, 2009 or 9/9/09 which, if it weren't for that irritating little zero, would be 9/9/9, and thereby would have been an important coincidence and trivia fact of some note. Nothing like this has happened since August 8, last year. Here are some amazing facts about the number nine to fool your friends with.

9 is the largest single digit number in the decimal system.
9 is the smallest odd number that isn't a prime, except for 1 and all the negative odd numbers.
9 is the smallest odd square integer, except for 1.
9 is 6 upside down, which means that 9/9/09 upside down is 60/6/6, somewhat like the number of the beast.
9 is the number of planets if you count Pluto.
9 times 9 is 81, and 8 plus 1 is 9.
9 is the number of the best cloud.
9 is the official integer of the Beatles White album.
9 is the number of fun facts if you count this one.

Life would be dull indeed without this seemingly mundane, yet odd, integer.
 
Mathematics news on Phys.org


Yes, nine has a lot of interesting properties, like:

1+8=9
2+7=9
3+6=9
4+5=9
5+4=9
6+3=9
7+2=9
8+1=9

Fascinating indeed - whichever way you try, it gives 9.

999=33*37 - to make three nines, we need three threes and a seven thrown in, which as we know is a lucky number.
 


.The third square and therefore the sum of two consecutive triangular numbers 9=3+6
.Written as 100 in base 3
.The only square that is the sum of two consecutive cubes 9=1 cubed +2 cubed
.The 4th lucky number,and the first square lucky number apart from 1
.9=1!+2!+3!
.The smallest Kaprekar number apart from1.9 squared=81 and 8+1=9
.There are nine regular polyhedra,the 5 Platonic solids and the 4 Kepler Poinsot stellated polyhedra.
.9 is the smallest numberof distinct integral squares into which a rectangle may be divided.The smallest solution is 32 by 33 and the squares have sides 1,4,7,8,9,10,14,15and 18.
.No in German is pronounced nine(Sorry I wanted to make 9 points)
 


jimmysnyder said:
Today is September, 9, 2009 or 9/9/09 which, if it weren't for that irritating little zero, would be 9/9/9, and thereby would have been an important coincidence and trivia fact of some note. Nothing like this has happened since August 8, last year. Here are some amazing facts about the number nine to fool your friends with.

9 is the largest single digit number in the decimal system.
9 is the smallest odd number that isn't a prime, except for 1 and all the negative odd numbers.
9 is the smallest odd square integer, except for 1.
9 is 6 upside down, which means that 9/9/09 upside down is 60/6/6, somewhat like the number of the beast.
9 is the number of planets if you count Pluto.
9 times 9 is 81, and 8 plus 1 is 9.
9 is the number of the best cloud.
9 is the official integer of the Beatles White album.
9 is the number of fun facts if you count this one.

Life would be dull indeed without this seemingly mundane, yet odd, integer.

Actually, it could be written in this manner - 09/09/09.
 


WhoWee said:
Actually, it could be written in this manner - 09/09/09.
But then we would be at a complete loss to know which 09 was for the year, month, and date. At least with 9/9/09, some of that confusion is reduced.
 


jimmysnyder said:
But then we would be at a complete loss to know which 09 was for the year, month, and date. At least with 9/9/09, some of that confusion is reduced.

I attempted to post at 09:09:09 on 09/09/09, but my computer wasn't fast enough.
 


WhoWee said:
I attempted to post at 09:09:09 on 09/09/09, but my computer wasn't fast enough.
good one!
 


jimmysnyder said:
9 is the number of fun facts if you count this one.
9 is the number of fingers on an inattentive wood shop worker.
 


mgb_phys said:
9 is the number of fingers on an inattentive wood shop worker.

After the first day, the story doesn't end here.
 
  • #10


mgb_phys said:
9 is the number of fingers on an inattentive wood shop worker.

:smile:

there're still other similar dates such as 10/10/10, 11/11/11, 12/12/12, that's it..
 
  • #11


drizzle said:
:smile:

there're still other similar dates such as 10/10/10, 11/11/11, 12/12/12, that's it..

I was born at 10:10 on 10/10/1959 - the 10th year of the decade.


Somehow my lucky number is 812?
 
  • #12


But,

1 is the lonliest number. :cool:
 
  • #13


As a kid, I was fascinated by the number four, and geometric representations of groups of 4 in 2 and 3 dimensions. Unfortunately, I missed the chance to celebrate on 04/04/04, so I'll just have to wait for it to come around again. :wink:
 
  • #14


Astronuc said:
But,

1 is the lonliest number. :cool:

And yet so many people want to be #1.:confused:
 
  • #15


AFAIR I have managed to remember to celebrate my 10,000th day :smile: but I forgot the 15,000th :cry:

Next nice occasion will be in 2017.
 
  • #16


Darn! 20,000 slipped by me. Well, at least I can shoot for 21,000 in a little over 5 weeks.
 
  • #17


Borek said:
Yes, nine has a lot of interesting properties, like:

1+8=9
2+7=9
3+6=9
4+5=9
5+4=9
6+3=9
7+2=9
8+1=9

Fascinating indeed - whichever way you try, it gives 9.

999=33*37 - to make three nines, we need three threes and a seven thrown in, which as we know is a lucky number.

Wow, that's just amazing. That can't be a coincidence!
Don't forget this remarkable fact: nine is 10 in base 9, but 9 modulo 10... !
 
  • #18


You're a little late on this 9/9/9 thing; it happened two thousand years ago. There's nothing significant about 9/9/2009.
No problem though, just wait exactly 7990 years and catch that one.
 
  • #19


leroyjenkens said:
just wait exactly 7990 years and catch that one.
Why? What's going to happen in 7990 years that didn't happen this year?
 
  • #21


jimmysnyder said:
why? What's going to happen in 7990 years that didn't happen this year?

9/9/9999 ?
 
  • #22


today 9/9/9 is my mom's 82 birthday, to bad it is't the 81st, that would be a real 9 fest
 
  • #23


9 holding the lofty position as the largest base 10 integer has properties just like the largest integer in any base.
 
  • #24


PF member-recommended Nine movies:

The Nines
The Ninth Configuration
The Ninth Gate
 
  • #25


We had our 999999 celebration at 9:09:09 this morning. We did make a compromise and celebrated at 9:09 local time instead of 9:09 Zulu.
 
  • #26


BobG said:
We had our 999999 celebration at 9:09:09 this morning.

It was a very quick celebration.
 
  • #27


Ivan Seeking said:
PF member-recommended Nine movies:

The Nines
The Ninth Configuration
The Ninth Gate

Or the animated movie that's released in theaters today called "9".
 
  • #28


Don't forget "Plan Nine from Outer Space."
 
  • #29


District 9... come on guys.
 
  • #30


No one else put this up yet?
1378672867_c047664900.jpg
 

Similar threads

Insights Fermat's Last Theorem
  • · Replies 105 ·
4
Replies
105
Views
10K
MHB Is There a Mathematical Basis for an Infinite Number of Twin Primes?
  • · Replies 7 ·
Replies
7
Views
4K
Graduate About a natural extension of Collatz conjecture
  • · Replies 0 ·
Replies
0
Views
531
Challenge Math Challenge - September 2021
  • · Replies 100 ·
4
Replies
100
Views
12K
Challenge Math Challenge - September 2020
  • · Replies 52 ·
2
Replies
52
Views
13K
Challenge Math Challenge - April 2019
  • · Replies 83 ·
3
Replies
83
Views
22K
Challenge Math Challenge - March 2019
  • · Replies 97 ·
4
Replies
97
Views
23K
Challenge Math Challenge - September 2019
  • · Replies 39 ·
2
Replies
39
Views
13K
Challenge Micromass' big September challenge
  • · Replies 77 ·
3
Replies
77
Views
12K
Challenge Math Challenge - October 2018
  • · Replies 71 ·
3
Replies
71
Views
14K