$ npm install geomagnetism --save
const geomagnetism = require('geomagnetism'); // information for "right now" const info = geomagnetism.model().point([44.53461, -109.05572]); console.log('declination:', info.decl); // use a specific date const model = geomagnetism.model(new Date('12/25/2017')); const info = model.point([44.53461, -109.05572]); console.log('declination:', info.decl);
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