@observerly/astrometry/dist/astrometry.js

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

import { g as h, u as M } from "./epoch-nmyjNjKp.js";
import { e as T, c as s, g as S, d as f } from "./utilities-BM-rBPno.js";
const p = (t, o) => {
  let e = T(Math.acos(Math.sin(s(t.θ)) * Math.sin(s(o.θ)) + Math.cos(s(t.θ)) * Math.cos(s(o.θ)) * Math.cos(s(t.φ - o.φ)))) % 360;
  return e < 0 && (e += 360), e;
}, J = (t) => ({
  θ: (t.θ + 180) % 360,
  φ: -t.φ
}), U = (t) => {
  const { θ: o, φ: e } = t;
  return {
    θ: S(o),
    φ: f(e)
  };
}, u = (t) => {
  const o = h(t), a = (Math.floor(o - 0.5) + 0.5 - 2451545) / 36525;
  let r = (6.697374558 + 2400.051336 * a + 25862e-9 * a ** 2) % 24;
  r < 0 && (r += 24);
  const c = M(t), i = (c.getUTCHours() + c.getUTCMinutes() / 60 + c.getUTCSeconds() / 3600 + c.getUTCMilliseconds() / 36e5) * 1.002737909;
  r += i;
  const g = r % 24;
  return g < 0 ? g + 24 : g;
}, G = u, d = (t, o) => {
  let n = (u(t) + o / 15) / 24;
  return n = n - Math.floor(n), n < 0 && (n += 1), 24 * n;
}, L = d, D = (t, o, e) => {
  let a = d(t, o) * 15 - e;
  return a < 0 && (a += 360), a;
}, z = (t) => {
  const e = (h(t) - 2451545) / 36525;
  return 23.439292 - (46.845 * e + 59e-5 * e ** 2 + 1813e-6 * e ** 3) / 3600;
}, A = (t, o, e) => {
  const { latitude: n, longitude: a } = o, { ra: r, dec: c } = e, l = s(D(t, a, r));
  let i = T(Math.atan2(Math.sin(l), Math.tan(s(n)) * Math.cos(s(c)) - Math.sin(s(c)) * Math.cos(l)));
  return i < 0 && (i += 360), i % 360;
};
export {
  G as GST,
  L as LST,
  p as getAngularSeparation,
  J as getAntipodeCoordinate,
  u as getGreenwhichSiderealTime,
  D as getHourAngle,
  d as getLocalSiderealTime,
  U as getNormalisedSphericalCoordinate,
  z as getObliquityOfTheEcliptic,
  A as getParallacticAngle
};
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