sunrise-sunset-js — Sunrise, Sunset & Twilight Times for JavaScript

00:00

— · · UTC

Elevation—

Azimuth—

Daylight—

getSunTimes · getTwilight

Anatomy of a day

Every threshold the sun crosses — dawns, dusks, golden and blue hours — computed to the second with NREL's Solar Position Algorithm. Drag the dial, or tap a card to jump there.

365 × getSunTimes

A year of light

Every spoke is one day — midnight at the core, midnight at the rim. Drag around the ring and watch the seasons reshape the sky above.

One import away

±30 s accuracy NREL SPA zero dependencies TypeScript Temporal API ready

npm install sunrise-sunset-js

import { getSunTimes, getSolarPosition } from 'sunrise-sunset-js';

// every threshold of the day, in one call
const t = getSunTimes(51.5074, -0.1278, new Date(), {
  timezoneId: 'Europe/London',
});

t.sunrise;                              // Date
t.twilight.goldenHour.evening.start;    // Date

// live solar position
getSolarPosition(51.5074, -0.1278);
// → { elevation: 61.9, azimuth: 180.3, … }

GitHub npm NREL SPA

sunrise-sunset-js — high-precision sunrise, sunset, twilight, golden-hour and solar-position calculation for JavaScript and TypeScript

Anatomy of a day

A year of light