Magnetic declination in JavaScript / Google Maps [closed]

Question

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago. Improve this question In the context of a Google Map JavaScript application, what is the best way to get the magnetic declination for a certain Lat/Lon? There seems to be no "easy" algorithm for that in JavaScript, or am I wrong? Is there a way with Google Maps API to determine this, I haven't found one... A Web Service which can be used. I have found WebSites offering this, but no API. Also see here, there they use a JavaScript class for this (see comment) JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

There do appear to be web services supplied by ngdc.noaa.gov. Have a look at the documentation - http://www.ngdc.noaa.gov/geomag-web/calculators/declinationHelp E.g. http://www.ngdc.noaa.gov/geomag-web/calculators/calculateDeclination?lat1=40&lon1=-105.25&resultFormat=xml