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solar-spa
WebAssembly build of NREL's Solar Position Algorithm for near-native speed.
WebAssemblynpm
About
solar-spa is a WebAssembly build of NREL's Solar Position Algorithm, delivering near-native performance for solar position calculations in Node and the browser.
Install
npm install solar-spaQuick start
import { spa } from 'solar-spa';
const result = await spa(
new Date(2025, 5, 21, 12, 0, 0), // June 21, 2025 at noon
40.7128, -74.0060, // NYC lat/lon
{ timezone: -4, elevation: 10 }, // EDT, 10m elevation
);
console.log(result.zenith, result.sunrise, result.sunset);