## Happy Fibonacci Day!

Discuss all general (i.e. non-personal) investing questions and issues, investing news, and theory.
Topic Author
Beensabu
Posts: 3068
Joined: Sun Aug 14, 2016 3:22 pm

### Happy Fibonacci Day!

Hey hey hey! It's Fibonacci Day!

In the Fibonacci sequence, each number is the sum of the two preceding numbers - ex. 1, 1, 2, 3, 5, 8, 13, 21, 34 and so on...

The golden ratio is 1.618. If you divide a number in the Fibonacci sequence by the preceding number, you'll get something close to the golden ratio. This works better for larger numbers later on in the sequence (not so great for 2 and 1...).

You may, on occasion, have noticed someone mention a thing called "Fibonacci retracement" (either in jest or complete seriousness). This is a technical analysis (TA) term. TA is sometimes referred to as finance "wizardry". It's all about trying to spotting patterns in charts. Fun times!

The Fibonacci retracement is about using the golden ratio to try to figure out how down a drawdown will go (or how up a rally will go), and identifying levels of "support" or "resistance". I don't know if it's any good at this.

If you ever wondered what on earth that person was talking about, now you know.

Happy Fibonacci Day! Have you snuggled a snail shell or hugged a tree today? There's still time.
"The only thing that makes life possible is permanent, intolerable uncertainty; not knowing what comes next." ~Ursula LeGuin
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### Re: Happy Fibonacci Day!

I don't get it! But happy fibonacci day to you too!
7eight9
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Joined: Fri May 17, 2019 7:11 pm

### Re: Happy Fibonacci Day!

Also known as Leonardo of Pisa, he is popularly known as Leonardo Fibonacci. Fibonacci is a contraction of filo Bonacci, meaning the son of Bonaccio.

Date Sequence
November 23 is celebrated as Fibonacci day because when the date is written in the mm/dd format (11/23), the digits in the date form a Fibonacci sequence: 1,1,2,3. A Fibonacci sequence is a series of numbers where a number is the sum of the two numbers before it. For example: 1, 1, 2, 3...is a Fibonacci sequence. Here, 2 is the sum of the two numbers before it (1+1). Similarly, 3 is the sum of the two numbers before it (1+2).

https://www.timeanddate.com/holidays/fun/fibonacci-day
I guess it all could be much worse. | They could be warming up my hearse.
Topic Author
Beensabu
Posts: 3068
Joined: Sun Aug 14, 2016 3:22 pm

### Re: Happy Fibonacci Day!

Also, let's not forget a shout out to Acharya Pingala.

And you can always eat cauliflower tonight if you don't feel like hugging nature.
"The only thing that makes life possible is permanent, intolerable uncertainty; not knowing what comes next." ~Ursula LeGuin
Topic Author
Beensabu
Posts: 3068
Joined: Sun Aug 14, 2016 3:22 pm

### Re: Happy Fibonacci Day!

colddeadfish wrote: Wed Nov 23, 2022 9:15 pm I don't get it! But happy fibonacci day to you too!
"The only thing that makes life possible is permanent, intolerable uncertainty; not knowing what comes next." ~Ursula LeGuin
Florida Orange
Posts: 438
Joined: Thu Jun 16, 2022 2:22 pm

### Re: Happy Fibonacci Day!

Beensabu wrote: Wed Nov 23, 2022 9:09 pm The golden ratio is 1.618. If you divide a number in the Fibonacci sequence by the preceding number, you'll get something close to the golden ratio. This works better for larger numbers later on in the sequence (not so great for 2 and 1...).
As it happens, the inverse of my ratio of U.S. stocks to international stocks is almost exactly 1.618. Does that mean I have a Fibonacci portfolio?
Topic Author
Beensabu
Posts: 3068
Joined: Sun Aug 14, 2016 3:22 pm

### Re: Happy Fibonacci Day!

Florida Orange wrote: Wed Nov 23, 2022 9:44 pm
Beensabu wrote: Wed Nov 23, 2022 9:09 pm The golden ratio is 1.618. If you divide a number in the Fibonacci sequence by the preceding number, you'll get something close to the golden ratio. This works better for larger numbers later on in the sequence (not so great for 2 and 1...).
As it happens, the inverse of my ratio of U.S. stocks to international stocks is almost exactly 1.618. Does that mean I have a Fibonacci portfolio?
What a coincidence! It must mean that. You are in harmony with the universe.
"The only thing that makes life possible is permanent, intolerable uncertainty; not knowing what comes next." ~Ursula LeGuin
MJS
Posts: 1017
Joined: Sat Aug 05, 2017 10:55 pm

### Re: Happy Fibonacci Day!

colddeadfish wrote: Wed Nov 23, 2022 9:15 pm I don't get it! But happy fibonacci day to you too!
OP: "In the Fibonacci sequence, each number is the sum of the two preceding numbers - ex. 1, 1, 2, 3, 5, 8, 13, 21, 34"

Today is 11 23 ... first 4 digits of the Fibonacci sequence.
Pi day = 3 14. Eat Pie!
E-Day (Eulers Number) = 2 17.
Yellow Pig Day is important to math nerds.

https://www.pleacher.com/mp/mfacts/mobdays.html
Ipsa scientia potestas est. Bacon F. Meditationes Sacrae.
dogperson
Posts: 65
Joined: Wed Feb 28, 2018 10:36 pm

### Re: Happy Fibonacci Day!

I don’t celebrate until 11/23/5813. Let’s hope the US doesn’t change to day/month/year notation before then.
HanSolo
Posts: 1347
Joined: Thu Jul 19, 2012 3:18 am

### Re: Happy Fibonacci Day!

MJS wrote: Thu Nov 24, 2022 12:10 am E-Day (Eulers Number) = 2 17.
I don't think so. The constant e = 2.71828...
dogperson wrote: Thu Nov 24, 2022 1:06 am I don’t celebrate until 11/23/5813. Let’s hope the US doesn’t change to day/month/year notation before then.
In some cultures (e.g., Chinese), they do year/month/day.

In that case, we missed our moment on 1123/5/8 13:21:34 (although it was John Bogle's "minus 806th" birthday).

We'll get another chance, however, on 11235/8/13 21:34:55 (birthday of Janet Yellen... and Danny Bonaduce).

You're right, Fibonacci numbers are kind of fun.
Last edited by HanSolo on Thu Nov 24, 2022 3:24 am, edited 1 time in total.
Strategic Macro Senior (top 1%, 2019 Bogleheads Contest)
EddyB
Posts: 1872
Joined: Fri May 24, 2013 3:43 pm

### Re: Happy Fibonacci Day!

HanSolo wrote: Thu Nov 24, 2022 2:47 am
dogperson wrote: Thu Nov 24, 2022 1:06 am I don’t celebrate until 11/23/5813. Let’s hope the US doesn’t change to day/month/year notation before then.
In some cultures (e.g., Chinese), they do year/month/day.

In that case, we missed our moment on 1123/5/8 13:21:34 (although it was John Bogle's "minus 806th" birthday).

We'll get another chance, however, on 11235/8/13 21:34:55 (birthday of Janet Yellen... and Danny Bonaduce).

You're right, Fibonacci numbers are kind of fun.
On 01/12/35 (December 1st, 2035), we’ll be sure to celebrate here in Europe (and birthdays for Bette Midler, Richard Pryor and Pablo Escobar).

My car is parked on a street named in honor of Fibonacci (even though he was Pisano).
grok87
Posts: 10225
Joined: Tue Feb 27, 2007 9:00 pm

### Re: Happy Fibonacci Day!

MJS wrote: Thu Nov 24, 2022 12:10 am
colddeadfish wrote: Wed Nov 23, 2022 9:15 pm I don't get it! But happy fibonacci day to you too!
OP: "In the Fibonacci sequence, each number is the sum of the two preceding numbers - ex. 1, 1, 2, 3, 5, 8, 13, 21, 34"

Today is 11 23 ... first 4 digits of the Fibonacci sequence.
Pi day = 3 14. Eat Pie!
E-Day (Eulers Number) = 2 17.
Yellow Pig Day is important to math nerds.

https://www.pleacher.com/mp/mfacts/mobdays.html
thanks first time i learned about yellow pig day!
RIP Mr. Bogle.
Posts: 1213
Joined: Tue Feb 07, 2017 9:08 am

### Re: Happy Fibonacci Day!

HanSolo wrote: Thu Nov 24, 2022 2:47 am In some cultures (e.g., Chinese), they do year/month/day.
Always preferred year/month/day because it can be sorted alphanumerically.

Fibonacci sequences are cool - the place I come across them most is sunflowers.

Charles Joseph
Posts: 712
Joined: Tue Apr 05, 2022 10:49 pm

### Re: Happy Fibonacci Day!

Beensabu wrote: Wed Nov 23, 2022 9:09 pm Hey hey hey! It's Fibonacci Day!
Makes me feel like Avogadro's number...
"What, me worry?"
Florida Orange
Posts: 438
Joined: Thu Jun 16, 2022 2:22 pm

### Re: Happy Fibonacci Day!

homebuyer6426 wrote: Thu Nov 24, 2022 8:35 am Always preferred year/month/day because it can be sorted alphanumerically.
Also it makes more sense to provide the big picture information first and then zoom in on the details rather than the other way around.
AnnetteLouisan
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Location: New York, NY

### Re: Happy Fibonacci Day!

I like this better than Pi day. This is a really elevated group we have here…
Kenkat
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Joined: Thu Mar 01, 2007 11:18 am
Location: Cincinnati, OH

### Re: Happy Fibonacci Day!

dogperson wrote: Thu Nov 24, 2022 1:06 am I don’t celebrate until 11/23/5813. Let’s hope the US doesn’t change to day/month/year notation before then.
Thanks, added it to my calendar!
LittleMaggieMae
Posts: 1953
Joined: Mon Aug 12, 2019 9:06 pm

### Re: Happy Fibonacci Day!

I'm late. Happy belated Fibonacci Day! I believe my 1940's kitchen is designed around a "Golden Ratio"