@observerly/astrometry/dist/observation.js

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

var d = Object.defineProperty;
var I = (r, i, t) => i in r ? d(r, i, { enumerable: !0, configurable: !0, writable: !0, value: t }) : r[i] = t;
var e = (r, i, t) => I(r, typeof i != "symbol" ? i + "" : i, t);
import { getCorrectionToEquatorialForAnnualAberration as l } from "./aberration.js";
import { getHourAngle as h } from "./astrometry.js";
import { convertEquatorialToHorizontal as N } from "./coordinates.js";
import { getCorrectionToEquatorialForNutation as T } from "./nutation.js";
import { getCorrectionToEquatorialForPrecessionOfEquinoxes as m } from "./precession.js";
import { g as c, d as E } from "./utilities-BM-rBPno.js";
// @license        Copyright © 2021-2023 observerly
class V extends Object {
  constructor({ ra: t = Number.NEGATIVE_INFINITY, dec: o = Number.NEGATIVE_INFINITY }, s) {
    super();
    // The initial target coordinate in epoch J2000 (ICRS) reference frame:
    e(this, "target", {
      ra: Number.NEGATIVE_INFINITY,
      dec: Number.NEGATIVE_INFINITY
    });
    // The Right Ascension in the current epoch:
    e(this, "ra", Number.NEGATIVE_INFINITY);
    // The Declination in the current epoch:
    e(this, "dec", Number.NEGATIVE_INFINITY);
    e(this, "az", Number.NEGATIVE_INFINITY);
    e(this, "alt", Number.NEGATIVE_INFINITY);
    e(this, "ha", Number.NEGATIVE_INFINITY);
    e(this, "datetime", /* @__PURE__ */ new Date());
    e(this, "longitude", Number.NEGATIVE_INFINITY);
    e(this, "latitude", Number.NEGATIVE_INFINITY);
    const { datetime: a, longitude: n, latitude: u } = s || {
      datetime: /* @__PURE__ */ new Date(),
      longitude: 0,
      latitude: 0
    };
    this.setDatetime(a), this.setLongitude(n), this.setLatitude(u), this.target = {
      ra: t,
      dec: o
    }, this.setEquatorialCoordinates({
      ra: t,
      dec: o
    }), this.setHourAngle(), this.setHorizontalCoordinates(N(a, {
      longitude: this.longitude,
      latitude: this.latitude
    }, {
      ra: this.ra,
      dec: this.dec
    }));
  }
  at({ datetime: t }) {
    t && this.setDatetime(t), this.setEquatorialCoordinates(this.target), this.setHorizontalCoordinates(N(this.datetime, {
      longitude: this.longitude,
      latitude: this.latitude
    }, {
      ra: this.ra,
      dec: this.dec
    }));
  }
  setDatetime(t) {
    this.datetime = new Date(Date.UTC(t.getUTCFullYear(), t.getUTCMonth(), t.getUTCDate(), t.getUTCHours(), t.getUTCMinutes(), t.getUTCSeconds(), t.getUTCMilliseconds()));
  }
  setEquatorialCoordinates(t) {
    const o = l(this.datetime, t), s = T(this.datetime, t), a = m(this.datetime, t), n = t.ra + o.ra + s.ra + a.ra, u = t.dec + o.dec + s.dec + a.dec;
    this.ra = c(n), this.dec = E(u);
  }
  setHourAngle() {
    this.ha = h(this.datetime, this.longitude, this.ra);
  }
  setHorizontalCoordinates(t) {
    const { az: o, alt: s } = t;
    this.az = o, this.alt = s;
  }
  setLongitude(t) {
    this.longitude = t;
  }
  setLatitude(t) {
    this.latitude = t;
  }
}
export {
  V as Observation
};
//# sourceMappingURL=observation.js.map