@observerly/astrometry/dist/maths.js

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

// @license        Copyright © 2021-2024 observerly
const M = (e, a, o) => {
  const t = [], [n, s] = e, [r, l] = a, p = Math.hypot(r - n, l - s), d = Math.ceil(p / o);
  for (let c = 0; c <= d; c++) {
    const i = c / d, u = n + i * (r - n), h = s + i * (l - s);
    t.push([u, h]);
  }
  return t;
}, y = (e, a, o) => {
  const t = [], [n, s] = e, [r, l] = a;
  let p = r;
  Math.abs(r - n) > 180 && (p = r > n ? r - 360 : r + 360);
  const d = Math.hypot(p - n, l - s), c = Math.ceil(d / o);
  for (let i = 0; i <= c; i++) {
    const u = i / c;
    let h = n + u * (p - n), f = s + u * (l - s);
    h = (h + 360) % 360, f = Math.max(-90, Math.min(90, f)), t.push([h, f]);
  }
  return t;
};
function X(e, a = 1) {
  const o = [];
  for (let t = 0; t < e.length - 1; t++) {
    const n = e[t], s = e[t + 1];
    o.push(...M(n, s, a));
  }
  return o;
}
function x(e, a = 1) {
  const o = [];
  for (let t = 0; t < e.length - 1; t++) {
    const n = e[t], s = e[t + 1];
    o.push(...y(n, s, a));
  }
  return o;
}
export {
  M as interpolate,
  y as interpolateGeodesic,
  X as interpolateRank2DArray,
  x as interpolateRank2DGeodesicCoordinateArray
};
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