Fernando Cabral wrote:

> I'd like to be able to calculate the apparent solar
> altitude, day by day from January first to December 31
> on a hourly base from 7 AM to 6 PM.
> 
> Do you know if any of the calculators available on
> the Internet can provide this?

Try one of the GeoAstro Applets designed by Jürgen Giesen which you can
reach at:

  http://www.jgiesen.de/

There you can find several JavaScript applets which are of interest to
sundialists.
 
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