Sun calculation js library which is fully based on formula from http://aa.quae.nl/en/reken/zonpositie.html
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2.3 KiB
2.3 KiB
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
const cls = require('calculation-ofsun')
console.log(cls.getSunInformation(new Date(), 33, 3))
/* Get Sun Information expected 3 parameters */
/* Date, lat, long */
How to use another functions that require juliandate as the parameter
const cls = require('calculation-ofsun');
const myJD = cls.dateToJD(new Date());
console.log(cls.solarTransit(myJD));
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 }