Re: Worldmap mercator projection - Latitude to Y calculation. - last try

On Fri, 1/23/2026 4:31 PM, R.Wieser wrote:
> Paul,
> 
>> If you take a math course, you're taught it is as Ellis explains.
> 
> Good for Ellis I suppose.  How does that help me, having googled and found 
> that different professions use those different names as they bloody wel 
> please ?
> 
> Also, in my very first posy I included "where ln(...) is log(...) / 
> log(10)", indicating that I already had the idea that "ln()" *PROBABLY* was 
> the natural logarithm, and how to get it using the standard base-10 log().
> 
> I ALREADY TRIED THAT, and still didn't get the expected result.
> 
> A few posts back I've provided the origional formule, the replacements I had 
> to make ( "ln()" and "sec()" ) and gave several intermediate results.
> 
> *Please* put that formule into whatever you want to use and see where the 
> intermediate results differ from mine - so I know were the problem is and 
> can try to fix it.
> 
> Regards,
> Rudy Wieser

I wrote a program, worked an example and put a dot on a map
in a posted picture. That's enough.

   Paul