88 lines
2.7 KiB
JavaScript
88 lines
2.7 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, '__esModule', { value: true });
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var base = require('./base.cjs');
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/**
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* @copyright 2013 Sonia Keys
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* @copyright 2016 commenthol
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* @license MIT
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* @module moonnode
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*/
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/**
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* Ascending returns the date of passage of the Moon through an ascending node.
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*
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* @param {Number} year - decimal year specifying a date near the event.
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* @returns {Number} jde of the event nearest the given date.
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*/
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function ascending (year) { // (year float64) float64
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return node(year, 0)
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}
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/**
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* Descending returns the date of passage of the Moon through a descending node.
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*
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* @param {Number} year - decimal year specifying a date near the event.
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* @returns {Number} jde of the event nearest the given date.
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*/
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function descending (year) { // (year float64) float64
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return node(year, 0.5)
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}
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/**
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* @private
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*/
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function node (y, h) { // (y, h float64) float64
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let k = (y - 2000.05) * 13.4223; // (50.1) p. 355
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k = Math.floor(k - h + 0.5) + h; // snap to half orbit
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const p = Math.PI / 180;
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const ck = 1 / 1342.23;
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const T = k * ck;
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const D = base["default"].horner(T, 183.638 * p, 331.73735682 * p / ck,
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0.0014852 * p, 0.00000209 * p, -0.00000001 * p);
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const M = base["default"].horner(T, 17.4006 * p, 26.8203725 * p / ck,
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0.0001186 * p, 0.00000006 * p);
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const m_ = base["default"].horner(T, 38.3776 * p, 355.52747313 * p / ck,
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0.0123499 * p, 0.000014627 * p, -0.000000069 * p);
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const Ω = base["default"].horner(T, 123.9767 * p, -1.44098956 * p / ck,
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0.0020608 * p, 0.00000214 * p, -0.000000016 * p);
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const V = base["default"].horner(T, 299.75 * p, 132.85 * p, -0.009173 * p);
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const P = Ω + 272.75 * p - 2.3 * p * T;
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const E = base["default"].horner(T, 1, -0.002516, -0.0000074);
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return base["default"].horner(T, 2451565.1619, 27.212220817 / ck,
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0.0002762, 0.000000021, -0.000000000088) +
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-0.4721 * Math.sin(m_) +
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-0.1649 * Math.sin(2 * D) +
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-0.0868 * Math.sin(2 * D - m_) +
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0.0084 * Math.sin(2 * D + m_) +
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-0.0083 * Math.sin(2 * D - M) * E +
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-0.0039 * Math.sin(2 * D - M - m_) * E +
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0.0034 * Math.sin(2 * m_) +
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-0.0031 * Math.sin(2 * (D - m_)) +
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0.003 * Math.sin(2 * D + M) * E +
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0.0028 * Math.sin(M - m_) * E +
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0.0026 * Math.sin(M) * E +
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0.0025 * Math.sin(4 * D) +
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0.0024 * Math.sin(D) +
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0.0022 * Math.sin(M + m_) * E +
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0.0017 * Math.sin(Ω) +
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0.0014 * Math.sin(4 * D - m_) +
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0.0005 * Math.sin(2 * D + M - m_) * E +
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0.0004 * Math.sin(2 * D - M + m_) * E +
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-0.0003 * Math.sin(2 * (D - M)) * E +
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0.0003 * Math.sin(4 * D - M) * E +
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0.0003 * Math.sin(V) +
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0.0003 * Math.sin(P)
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}
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var moonnode = {
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ascending,
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descending
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};
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exports.ascending = ascending;
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exports["default"] = moonnode;
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exports.descending = descending;
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