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Pi in the Sky Over New York

7/30/2014 02:22 PM EDT
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y_sasaki
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355/113
y_sasaki   7/30/2014 7:28:18 PM
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355/113 is 3.1415929203... Pretty much close to Pi (3.141592653589...). When you have to deal with Pi with 8 or 16bit embedded MCU, multiply with 355 then divide by 113 can be a good-ehough substitute of Pi :-)

Sheepdoll
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22/7
Sheepdoll   7/30/2014 10:26:22 PM
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A number of my old engineering text books from the slide rule days give 22/7 as a shortcut to pi.  Good to 5 digits of accuracy, which most sin/cos tables were composed to.

My class (those born in 1960) were probably the last group in the high school system to be taught slide rule.  In my first year of college one professor considered calculators to be a form of cheating.

 

prabhakar_deosthali
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Novel way of teaching maths
prabhakar_deosthali   7/31/2014 2:34:50 AM
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This is a good combination of Science, technology and Nature.

Anyone who saw this wil never forget the constant PI , in his/her lifetime.

 

wilber_xbox
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Re: Novel way of teaching maths
wilber_xbox   7/31/2014 4:38:17 AM
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This is cool and high-tech display of geeky things.

Susan Rambo
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Re: Novel way of teaching maths
Susan Rambo   7/31/2014 11:18:50 AM
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I wonder how much this cost. Pretty clever --  a lot of coordination must have gone into this.

elctrnx_lyf
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Re: Novel way of teaching maths
elctrnx_lyf   7/31/2014 1:00:21 PM
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Just imagine how many vegetables were used to produce this vegetable oil.

y_sasaki
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Re: Novel way of teaching maths
y_sasaki   7/31/2014 1:29:45 PM
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Apart from smoke generator, airplane need fuel to drive thier engine. 100LL aviation gasoline (AVGAS) still contains lead (LL is short for "Low Lead") - not exactly eco-friendly :-( It has been long argument when / how do we transision from AVGAS to something else, and what is that "something else". Automobile gasoline, methanol, diesel has been proposed but not widely adopted yet (FAA certification is costly and time-consuming).

It is interesting to hear other "Integer substitution of Pi", 22/7 and 201/64. I will put them in my toolbox. Slide rule and 8-bit CPU days are fading, but I may need them someday, just in case :-)

junko.yoshida
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STEAM
junko.yoshida   7/31/2014 4:37:31 AM
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A very cool story, Jessica! I agree...adding "Art" to STEM makes the wonder of science so much more accessible to the masses!

Jessica Lipsky
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Re: STEAM
Jessica Lipsky   7/31/2014 10:50:29 AM
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Agreed!  The more I hear about the necisity of adding a fashion component to wearables (and fashion can be art!), the more I think about STEAM v. STEM.

DrFPGA
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Re: STEAM
DrFPGA   8/29/2014 7:02:06 PM
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Gives steam punk a whole new meaning too...

kfield
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Crowd reaction
kfield   7/31/2014 8:39:20 AM
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Totally, totally cool. I wonder how many people knew what they were seeing when they looked up at it? 

Wnderer
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201/64
Wnderer   7/31/2014 9:54:07 AM
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If you're dealing with a simple processor and integer math, 201/64 can use bit shifts for divisions. You can use Num * 201 >> 6 (divide by 64)  or Num * 201 << 2 (multiply by 4) and drop the low byte.

 There is also 3217>>10 but you will need to have large enough variables to handle the 3217 multiply.

donq_#1
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Re: 201/64
donq_#1   8/4/2014 12:35:28 PM
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355/113 is another good fraction that is accurate to the 6th decimal place.

chanj0
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Art + Technology = ?
chanj0   7/31/2014 8:25:12 PM
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It's very cool. I wonder when artist will start using Drone to paint art in the sky.

DrQuine
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Science and Art Intersect Over Manhattan
DrQuine   8/17/2014 2:49:59 PM
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This is a wonderful story - and one that I managed to miss until reading it in EETimes. Such public displays open up conversations that otherwise would not occur. I'm also impressed by the advances in skywriting freom what I'd previously known.  The ability to make a message quickly is essential to achieve legibility.

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