Sun calculation js library which is fully based on formula from http://aa.quae.nl/en/reken/zonpositie.html
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82 lines
2.8 KiB
82 lines
2.8 KiB
# Calculation of sun
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[](http://inch-ci.org/github/OrionStark/calculation-of-sun)
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Sun calculation fully based on formula from http://aa.quae.nl/en/reken/zonpositie.html
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## Warning
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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.
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## Install with npm
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npm install calculation-ofsun
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## Without npm
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1. Clone this project
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2. Create your new js file
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3. Import the solar-calculation.js to your code. You could find the script in dist directory
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4. Then, have fun
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## Attention
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If you didn't understand what I'm saying about how to use it without npm. You could check the main.js.
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That's it.
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## How to Use It
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```javascript
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const cls = require('calculation-ofsun')
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console.log(cls.getSunInformation(new Date(), 33, 3))
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/* Get Sun Information expected 3 parameters */
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/* Date, lat, long */
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/* For the other function and it's parameter. You could check on the table below */
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```
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## How to use another functions that require juliandate as the parameter
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```javascript
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const cls = require('calculation-ofsun');
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const myJD = cls.dateToJD(new Date());
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console.log(cls.solarTransit(myJD));
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```
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You can also call any function except getSunPosition, because it automatically calls by the
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getSunInformation function to get sun position according to your input parameters for getSunInformation.
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## Functions parameter
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Function Name | Expected Parameter
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------------- | ------------------
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getSunInformation | Date, latitude, longtitude
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dateToJD | Date
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jdTODate | JulianDate
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equation_of_center | JulianDate
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earthMeanAnomaly | JulianDate
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earthTrueAnomaly | JulianDate
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eclipticLongtitude | JulianDate
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rightAscension | JulianDate
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declination | JulianDate
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sideraltime | JulianDate
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getHourAngle | JulianDate
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getSunPosition | None, Dont use it
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solarTransit | JulianDate
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sunriseandsunset | JulianDate
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## Example of return object from getSunInformation functions
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Nethereland GMT +1
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It'll return time denpend on your local time
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{ sun_position: {
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azimuth: -101.53872252647008,
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altitude: 57.268164438252526
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},
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date: 'Sat Apr 14 2018 10:16:32 GMT+0700 (WIB)',
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observe_location: {
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latitude: 3.597031,
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longitude: 98.678513
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},
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sunrise: 'Sat Apr 14 2018 06:21:42 GMT+0700 (WIB)',
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sunset: 'Sat Apr 14 2018 18:32:54 GMT+0700 (WIB)',
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solar_transit: 2458222.7272965494,
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hour_angle: 327.53679257420777,
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right_ascension:
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{ degrees: 22.060782554336377,
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rad: 0.38503329113969464
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},
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clientJD: 2458222.6364905904
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}
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