@observerly/astrometry/dist/twilight.js

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

import { convertEquatorialToHorizontal as g } from "./coordinates.js";
import { getSolarEquatorialCoordinate as m } from "./sun.js";
var n;
(function(t) {
  t.Night = "Night", t.Astronomical = "Astronomical", t.Nautical = "Nautical", t.Civil = "Civil", t.Day = "Day";
})(n || (n = {}));
const h = (t) => {
  switch (!0) {
    case t < -18:
      return n.Night;
    case t < -12:
      return n.Astronomical;
    case t < -6:
      return n.Nautical;
    case t < 0:
      return n.Civil;
    default:
      return n.Day;
  }
}, C = (t, i, D = {
  stepSeconds: 10
}) => {
  const { stepSeconds: w = 10 } = D, s = new Date(t.getFullYear(), t.getMonth(), t.getDate()), c = new Date(s.getTime() + 864e5);
  let e = new Date(s.getTime());
  const a = [], f = m(e), { alt: p } = g(e, i, f);
  let o = h(p), r = new Date(e.getTime());
  for (; e < c; ) {
    const v = m(e), { alt: N } = g(e, i, v), l = h(N);
    if (l !== o) {
      const u = new Date(e.getTime());
      a.push({
        name: o,
        interval: {
          from: r,
          to: u
        }
      }), o = l, r = u;
    }
    e = new Date(e.getTime() + w * 1e3);
  }
  return a.push({
    name: o,
    interval: {
      from: r,
      to: c
    }
  }), a;
};
export {
  n as Twilight,
  C as getTwilightBandsForDay
};
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