ephemeris

This source is modified version of xerik. Thank you for such a brilliant piece of work.

This is basically Javascript implementation of Moshier's ephemeris calculations for sun, planets, comets, asteroids and stars.

Which, initially written by mivion, xerik converted it into a node module. This is a slight customized version with following changes:

1. Changes the transit method to get standard sun/moon rise/set times as well as a custom horizon based
2. Takes in Moment date object as opposed to a date time string
3. Implements a method to just fetch in single planet as opposed to all of it
4. Removes html, css bit to keep it focused to one task
5. Reformats the code

Installation

npm install ephemeris

Usage

app.js

const ephemeris = require('ephemeris');
const Moment = require('moment-timezone');
const dateObj = new Moment.tz('10.08.2015 17:09:01', 'DD.MM.YYYY HH:mm:ss', 'UTC')

// parameters: ephemeris.getAllPlanets(dateObj, longitude, latitude, height);
var result = ephemeris.getAllPlanets(dateObj, 10.0014, 53.5653, 0);

/* Check out the namespaces: date, observer and observed:

{ date:
   { gregorianTerrestrial: '10.8.2015 17:9:1',
     gregorianTerrestrialRaw:
      { day: 10,
        month: 8,
        year: 2015,
        hours: 17,
        minutes: 9,
        seconds: 1,
        julianDate: 2457244.5,
        julianTime: 0.7145949074074074,
        julian: 2457245.2145949076,
        j2000: 2015.6063370154895,
        b1950: 2015.6065478300004,
        j1900: 2015.6063370154895,
        delta: 68.01714323102905,
        terrestrial: 2457245.2145949076,
        universal: 2457245.2138076723,
        universalDate: [Object],
        universalDateString: '10.8.2015 17:7:52.983' },
     gregorianUniversal: '10.8.2015 17:7:52.983',
     gregorianDelta: '00:00:68.01714323102905',
     julianTerrestrial: 2457245.2145949076,
     julianUniversal: 2457245.2138076723,
     julianDelta: 0.0007872354540628362 },
  observer:
   { name: 'earth',
     longitueGeodetic: 10.0014,
     longitudeGeodecentric: 10.0014,
     latitudeGeodetic: 53.5653,
     latitudeGeodecentric: 53.38123133267187,
     heightGeodetic: 0,
     heightGeodecentric: 6364.336264644461 },
  observed:
   { sun:
      { name: 'sun',
        raw: [Object],
        apparentLongitudeDms30: '17°45\'39"',
        apparentLongitudeDms360: '137°45\'39"',
        apparentLongitudeDd: 137.76105855382917,
        geocentricDistanceKm: -1 },
     mercury:
      { name: 'mercury',
        raw: [Object],
        apparentLongitudeDms30: '5°2\'10"',
        apparentLongitudeDms360: '155°2\'10"',
        apparentLongitudeDd: 155.03637003916958,
        geocentricDistanceKm: -1 },
     venus:
      { name: 'venus',
        raw: [Object],
        apparentLongitudeDms30: '25°43\'16"',
        apparentLongitudeDms360: '145°43\'16"',
        apparentLongitudeDd: 145.7212923824036,
        geocentricDistanceKm: -1 },
     moon:
      { name: 'moon',
        raw: [Object],
        apparentLongitudeDms30: '2°41\'17"',
        apparentLongitudeDms360: '92°41\'17"',
        apparentLongitudeDd: 92.68823373136327,
        geocentricDistanceKm: 61.007764233212335 },
     mars:
      { name: 'mars',
        raw: [Object],
        apparentLongitudeDms30: '1°7\'20"',
        apparentLongitudeDms360: '121°7\'20"',
        apparentLongitudeDd: 121.12222806696656,
        geocentricDistanceKm: -1 },
     jupiter:
      { name: 'jupiter',
        raw: [Object],
        apparentLongitudeDms30: '29°50\'16"',
        apparentLongitudeDms360: '149°50\'16"',
        apparentLongitudeDd: 149.83799891400335,
        geocentricDistanceKm: -1 },
     saturn:
      { name: 'saturn',
        raw: [Object],
        apparentLongitudeDms30: '28°20\'25"',
        apparentLongitudeDms360: '238°20\'25"',
        apparentLongitudeDd: 238.34045318452542,
        geocentricDistanceKm: -1 },
     uranus:
      { name: 'uranus',
        raw: [Object],
        apparentLongitudeDms30: '20°24\'33"',
        apparentLongitudeDms360: '20°24\'33"',
        apparentLongitudeDd: 20.40921989582207,
        geocentricDistanceKm: -1 },
     neptune:
      { name: 'neptune',
        raw: [Object],
        apparentLongitudeDms30: '8°58\'37"',
        apparentLongitudeDms360: '338°58\'37"',
        apparentLongitudeDd: 338.9771304673532,
        geocentricDistanceKm: -1 },
     pluto:
      { name: 'pluto',
        raw: [Object],
        apparentLongitudeDms30: '13°27\'13"',
        apparentLongitudeDms360: '283°27\'13"',
        apparentLongitudeDd: 283.4537823191463,
        geocentricDistanceKm: -1 },
     chiron:
      { name: 'chiron',
        raw: [Object],
        apparentLongitudeDms30: '20°41\'58"',
        apparentLongitudeDms360: '350°41\'58"',
        apparentLongitudeDd: 350.6995558283406,
        geocentricDistanceKm: -1 },
     sirius:
      { name: 'sirius',
        raw: [Object],
        apparentLongitudeDms30: '11°27\'17"',
        apparentLongitudeDms360: '101°27\'17"',
        apparentLongitudeDd: 1.7707222368344282,
        geocentricDistanceKm: 7777 } } }
*/

Contributers

This implementation based on code by Steve Moshier.

The inital Javascript code has been written by xerik.

License

GPL-2