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Re: Formula for Earth radius at any given latitude.

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On Thursday, January 31, 2008 at 4:54:17 PM UTC-2, Poster Matt wrote:
> The thread 'distance between lon and lat', at the end of last year, was 
> interesting. Those with an interest in the subject might want to look at 
> the Haversine Formula on the page linked below. I can't remember if this 
> was mentioned in the thread or not, the thread is so long it'll take ages 
> to check, and my useless newsgroup software won't let me search!
> 
> Haversine Formula:
> http://www.movable-type.co.uk/scripts/gis-faq-5.1.html
> 
> 
> My question is slightly different. The mean radius of the Earth is approx. 
> 6,372 km, but what formula is used to calculate the radius of the Earth 
> for any given latitude?
> 
> I wish my trig was up to working this out but I'm just a humble computer 
> scientist with no degree in math.
> 
> Thank you all for any help in this.

Hello. You could use this online tool.

https://rechneronline.de/earth-radius/

It has also the formula for any latitude, so you can create a function.

If you get the poles and equator radius (6,356.752 km and 6,378.137 km) from this website, you can see you get the same value as you can see in this page https://en.wikipedia.org/wiki/Earth_radius#Global_average_radii.

So I think the formula is correct!

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Re: Formula for Earth radius at any given latitude. glauber.ludwig@gmail.com - 2018-01-12 02:49 -0800

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