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Example code of abbadon1334/sun-position-spa-php

Informations about the package sun-position-spa-php

Sun-Position-SPA-php

SPA Sun Position Calc Library for PHP

Build Status Coverage Status Maintainability Test Coverage Codacy Badge Codacy Badge

This library is based on the work of Ibrahim Reda and Afshin Andreas (SPA) Solar Position Algorithm for Solar Radiation Applications ( 2008 National Renewable Energy Laboratory )

Abstract from the original study

There have been many published articles describing solar position algorithms for solar radiation applications. The best uncertainty achieved in most of these articles is greater than ±0.01 / in calculating the solar zenith and azimuth angles. For some, the algorithm is valid for a limited number of years varying from 15 years to a hundred years. This report is a step by step procedure for implementing an algorithm to calculate the solar zenith and azimuth angles in the period from the year -2000 to 6000, with uncertainties of ±0.0003°

PHPUNIT TEST

Library test data vs Table A.4 of the original study

C Source code for Solar Position Algorithm (SPA)

http://www.nrel.gov/midc/spa/

Requirements

Composer install

Simple Usage

Available attributes after calculate() :

I know this attributes names are not so ortodox. Formulas that are present in the original document are really complex and using the same name for variables is a big aid for debugging

Example to get angle H° - Observer hour angle (degrees)

to get H° Observer hour angle (degrees)

Example to get fraction day for sunrise - transit - sunset

Get Sun Incidence Angle

All versions of sun-position-spa-php with dependencies

PHP Build Version
Package Version
Requires php Version >=7.2
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