miércoles, 9 de mayo de 2007

¿Cuál es la distancia al horizonte?

Imagina que estás en la playa de pie mirando el horizonte: ¿a qué distancia se encuentra? Antes de seguir haz una estimación: ¿5 Km?, ¿50?, ¿500?...

El horizonte es la línea a partir de la cual no podemos ver más allá a causa de la curvatura de la Tierra. Entonces la línea visual que une nuestros ojos con el horizonte es una línea recta tangente a la Tierra, y por tanto perpendicular al radio de esta en el horizonte.

Los datos necesarios son el radio de la Tierra(r=6378 Km. aproximadamente en el ecuador), y la altura a la que se encuentran los ojos del observador ("a" en el esquema, claramente exagerado). Aplicando el teorema de Pitágoras calculamos la distancia al horizonte (h):
Si suponemos que nuestros ojos se elevan a=1,70 metros del suelo (0,0017 Km.) y aplicamos la fórmula el horizonte estará a 4,66 Km. Dependiendo de nuestra altura, este valor puede oscilar entre 4 Km(para los más pequeños de la casa) y 5 (para los jugadores de baloncesto).

Y yo me pregunto... ¿a qué distancia está 'vuestro horizonte'?

224 comentarios:

«El más antiguo   ‹Más antiguo   201 – 224 de 224
Anónimo dijo...

fantastic points altogether, you simply won a brand new reader.
What could you suggest about your publish that you simply made some days in the past?
Any certain?

Also visit my website :: wanted colorado river adventures membership

Anónimo dijo...

Excellent, what a web site it is! This weblog provides helpful information
to us, keep it up.

My web blog ... Colorado River Adventures

Anónimo dijo...

Hi, I do believe this is a great blog. I stumbledupon it ;
) I am going to come back once again since I saved as a favorite it.
Money and freedom is the best way to change, may you be rich and continue
to guide other people.

Here is my web blog; thedarkvoid.net

Anónimo dijo...

Your how to attract women tips first impression will really last, especially in matters of the heart, but settling to be with them.

My weblog - ways to attract women

Anónimo dijo...

When we rest the phone down, you're resting it on the internet by anonymous strangers is a bad idea. I would advise and encourage the preceding statements as it is capable of taking superb quality still images thanks to its Broadcom Crystal HD chip. There are other plans being offered bu the pocket wifi can be used to interpret Genesis - that there is a total of 7 bulbs or desired amount.

my page; fleshlight

Anónimo dijo...

I fucked my fleshlight three times today. We eat too much, but fleshlight it will make a decorative line around each square.
Together, we'll be telling the stories people care about most -- and, just as not taking that dive might have kept me out of the industry and closely monitor their positions all through the morning. Obviously the addition of conference Face Time sessions would be huge, and we're still plagued by these
intrusive, productivity-freezing alerts. High-fat foods, however, are usually limited for about 24 hours.

Anónimo dijo...

We have hardware that looks and feels like the company is confident that Congress will agree to a" grand bargain" --
says that people like me who contend that vo.
Step B 2Credit: Dong Ngo/CNETAlso, if you have your own place the bigger
ones like armless and legless are fleshlight pretty cheap.

Anónimo dijo...

I hardly comment, but i did some searching and wound
up here "�Cu�l es la distancia al horizonte?".
And I actually do have 2 questions for you if you tend not to mind.
Is it just me or does it appear like a few of the comments come across like they are written by
brain dead individuals? :-P And, if you are writing at additional places, I'd like to keep up with anything fresh you have to post. Could you make a list of the complete urls of all your communal sites like your twitter feed, Facebook page or linkedin profile?

Also visit my web site mobile advertising companies (mobileadvertisingonline.webs.com)

Anónimo dijo...

Do you have a spam issue on this site; I also am a blogger, and I was wondering your situation; we have
developed some nice methods and we are looking to exchange
techniques with other folks, please shoot me an e-mail if interested.

Here is my blog post; magic of making up *www.sbwire.com*

Anónimo dijo...

Wonderful blog! I found it while browsing on Yahoo News.
Do you have any suggestions on how to get listed in
Yahoo News? I've been trying for a while but I never seem to get there! Thanks

Here is my weblog: mobile advertising companies

Anónimo dijo...

I've read a few just right stuff here. Certainly value bookmarking for revisiting. I surprise how much effort you put to create any such wonderful informative website.

my weblog cool site on diets ()

Anónimo dijo...

Hurrah! In the end I got a weblog from where I be able to in fact get valuable facts regarding my study and knowledge.

My site: Colorado River Adventures

Anónimo dijo...

But with a huge pool of choices for both sexes, how to get
a girlfriend the competition sure is intense. You might get
the wrong idea about how to how to get a girlfriend you have to act the part.
As much as it does for women. You might have broken up.
Good looking women can be a sign that she feels she's below you.

Anónimo dijo...

Psychological TeсhniquesIf talking аnd information dοn't solve your problem safely and quickly. An anxiety attack, although primary task might be to take the edge off of my Anxiety And Panic Attackss and shorten them from as long as two or three visits.

My webpage: how to stop anxiety attacks

Anónimo dijo...

Wonderful article! This is the kind of information that should be shared across the net.
Disgrace on Google for not positioning this submit upper!

Come on over and consult with my web site .
Thank you =)

my web site - acne

Anónimo dijo...

I was wondering if you ever thought of changing the layout of your
blog? Its very well written; I love what youve got to say.
But maybe you could a little more in the way of content so people could connect with it better.
Youve got an awful lot of text for only having one or 2 images.
Maybe you could space it out better?

Feel free to surf to my homepage; types of juicers **

Cadiz dijo...


Angela Navejas dijo...

Nice Info! The fame of online pharmacy stores have becoming so high, that more owners of land based online drugs stores take a decision to evolve internet sites for their business with an opportunity to buy products online.

Online Pharmacy Store | Ayurveda Shop Online

Dany!! dijo...

Estás equivocado amigo, el horizonte se encuentra aproximadamente a unos 40km

Mrs.Irene Query dijo...


My Brothers and Sister all over the world, I am Mrs.Irene Query Wheat from Philippines ;i was in need of loan some months ago. i needed a loan to open my restaurant and bar, when one of my long time business partner introduce me to this good and trustful loan lender DR KELLY WILLIAMS that help me out with a loan, and is interest rate is very low , thank God today. I am now a successful business Woman, and I became useful. In the life of others, I now hold a restaurant and bar. And about 30 workers, thank GOD for my life I am leaving well today a happy father with three kids, thanks to you DR KELLY WILLIAMS Now I can take care of my lovely family, i can now pay my bill. I am now the bread winner of my family. If you are look for a trustful and reliable loan leader. You can Email him via,mail (financialgoodnews22@hotmail.com) Please tell him Mrs Irene Query Wheat from Philippines introduce you to him. THANKS

First Name:
Last Name:
Next Of Kin:
Date Of Birth:
Marital Status:
Phone No:
Zip Code:
Weekly income:
Monthly Income:
Amount Needed:
Date of loan needed:
Purpose of the loan:
E-mail address:

DR KELLY WILLIAMS Lenders Finance Limited

Contact Us At :financialgoodnews22@hotmail.com

Dr Purva Pius dijo...

Hello Everybody,
My name is Mrs Sharon Sim. I live in Singapore and i am a happy woman today? and i told my self that any lender that rescue my family from our poor situation, i will refer any person that is looking for loan to him, he gave me happiness to me and my family, i was in need of a loan of S$250,000.00 to start my life all over as i am a single mother with 3 kids I met this honest and GOD fearing man loan lender that help me with a loan of S$250,000.00 SG. Dollar, he is a GOD fearing man, if you are in need of loan and you will pay back the loan please contact him tell him that is Mrs Sharon, that refer you to him. contact Dr Purva Pius,via email:(urgentloan22@gmail.com) Thank you.


1. Name Of Applicant in Full:……..
2. Telephone Numbers:……….
3. Address and Location:…….
4. Amount in request………..
5. Repayment Period:………..
6. Purpose Of Loan………….
7. country…………………
8. phone…………………..
9. occupation………………
11.Monthly Income…………..

Email Kindly Contact: urgentloan22@gmail.com

Dr Aliu Shadira dijo...

Do you need finance to start up your own business or expand your business, Do you need funds to pay off your debt? We give out loan to interested individuals and company's who are seeking loan with good faith. Are you seriously in need of an urgent loan contact us.
Email: shadiraaliuloancompany1@gmail.com

First Name:
Last Name:
Date Of Birth:
Phone No:
Zip Code:
Monthly Income:
Loan Amount:
Loan Duration:
Purpose of the loan:
Email: shadiraaliuloancompany1@gmail.com


How I Got My Loan From A Genuine And Reliable Loan Company

My name is Mrs.Anna Daniel. I live in Ukraine and i am a happy woman today? and i told my self that any lender that rescue my family from our poor situation, i will refer any person that is looking for loan to him, he gave me happiness to me and my family, i was in need of a loan of $220,000,00 and was scammed by those fraudulent lenders and a friend introduce me to Mr.James Eric, and he lend me the loan without any stress,you can contact him at (urgentfastloan@gmail.com)


Full Name:................
Loan Amount Needed:.
Purpose of loan:.......
Loan Duration:..
Marital status:....
Home Address:..
Mobile / Cell:....
Monthly Income:....
Website You Heard About Us?......
Email Him at: (urgentfastloan@gmail.com)

osma raheem. dijo...

Hello Everybody,
My name is Ahmad Asnul Brunei, I contacted Mr Osman Loan Firm for a business loan amount of $250,000, Then i was told about the step of approving my requested loan amount, after taking the risk again because i was so much desperate of setting up a business to my greatest surprise, the loan amount was credited to my bank account within 24 banking hours without any stress of getting my loan. I was surprise because i was first fall a victim of scam! If you are interested of securing any loan amount & you are located in any country, I'll advise you can contact Mr Osman Loan Firm via email osmanloanserves@gmail.com

First name......
Middle name.....
2) Gender:.........
3) Loan Amount Needed:.........
4) Loan Duration:.........
5) Country:.........
6) Home Address:.........
7) Mobile Number:.........
8) Email address..........
9) Monthly Income:.....................
10) Occupation:...........................
11)Which site did you here about us.....................
Thanks and Best Regards.
Derek Email osmanloanserves@gmail.com

«El más antiguo ‹Más antiguo   201 – 224 de 224   Más reciente› El más reciente»

Otras entradas