Calculation of sun

Sun calculation fully based on formula from http://aa.quae.nl/en/reken/zonpositie.html

Warning

This program is not really accurate about the calculation. For the sunrise and sunset, the error value is about 2 minutes miss from the actual time. For the Altitude the error value is near 0.6 degrees and the azimuth as well.

Install with npm

npm install calculation-ofsun

How to Use It

'''javascript
const cls = require('calculation-ofsun')
console.log(cls.getSunInformation(new Date(), 33, 3))
/* Get Sun Information expected 3 parameters */
/* Date, lat, long */
'''

You can also call any function except getSunPosition, because it automatically calls by the getSunInformation function to get sun position according to your input parameters for getSunInformation.

Functions parameter

Function Name	Expected Parameter
getSunInformation	Date, latitude, longtitude
dateToJD	Date
jdTODate	JulianDate
equation_of_center	JulianDate
earthMeanAnomaly	JulianDate
earthTrueAnomaly	JulianDate
eclipticLongtitude	JulianDate
rightAscension	JulianDate
declination	JulianDate
sideraltime	JulianDate
getHourAngle	JulianDate
getSunPosition	None, Dont use it
solarTransit	JulianDate
sunriseandsunset	JulianDate

Example of return object from getSunInformation functions

Nethereland GMT +1 It'll return time denpend on your local time

{   sun_position: { azimuth: -77.80678591967518, altitude: 4.0819291879429525 },
    date: 'Sat Mar 10 2018 13:39:40 GMT+0700 (WIB)', 
    sunrise: 'Sat Mar 10 2018 13:07:56 GMT+0700 (WIB)',
    sunset: 'Sun Mar 11 2018 00:36:33 GMT+0700 (WIB)',
    mean_anomaly: { degrees: 64.65251729583633, rad: 1.1283992965149248 },
    solar_transit: 2458187.994618933,
    equation_of_center: { degrees: 1.7458618484586093, rad: 0.03047103754055702 },
    h: 282.14627224302416,
    RA: { degrees: -9.80213468943287, rad: -0.17107952405455543 },
    clientJD: 2458187.777554097,
    true_anomaly: { degrees: 66.39837914429494, rad: 1.1588703340554818 },
    sideraltime: 272.3441375535913 }