@observerly/astrometry/dist/temporal.js

observerly's lightweight, zero-dependency, type safe astrometry library written in Typescript for calculating the position of celestial objects in the sky.

import { J1970 as u } from "./constants.js";
import { g as f } from "./epoch-nmyjNjKp.js";
// @license        Copyright © 2021-2023 observerly
const J = (o) => new Date((o - u) * 864e5), U = (o, e) => {
  const { longitude: l } = e;
  let t = o - l / 15;
  return t < 0 && (t += 24), t > 24 && (t -= 24), t;
}, v = (o, e) => {
  e = new Date(e.getTime() + e.getTimezoneOffset() * 6e4);
  const l = f(new Date(Date.UTC(e.getFullYear(), e.getMonth(), e.getDate(), 0, 0, 0, 0))), t = f(new Date(Date.UTC(e.getFullYear(), 1, 1, 0, 0, 0, 0))) - 1, g = l - t, a = (t - 2415020) / 36525, D = 24 - (6.6460656 + 2400.051262 * a + 2581e-8 * a ** 2) + 24 * (e.getFullYear() - 1900);
  let n = 0.0657098 * g - D;
  n < 0 && (n += 24), n > 24 && (n -= 24);
  let s = o - n;
  s < 0 && (s += 24);
  const r = 0.99727 * s, i = Math.floor(r), c = Math.floor((r - i) * 60), T = Math.floor(((r - i) * 60 - c) * 60), m = Math.floor((((r - i) * 60 - c) * 60 - T) * 1e3);
  return new Date(e.getFullYear(), e.getMonth(), e.getDate(), i, c, T, m);
};
export {
  v as convertGreenwhichSiderealTimeToUniversalTime,
  J as convertJulianDateToUTC,
  U as convertLocalSiderealTimeToGreenwhichSiderealTime
};
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