Solar Position Algorithm

Java implementation of the NREL's Solar Position Algorithm (SPA).

This algorithm calculates the solar zenith and azimuth angles in the period from the year -2000 to 6000, with uncertainties of +/- 0.0003 degrees based on the date, time, and location on Earth. (Reference: Reda, I.; Andreas, A., Solar Position Algorithm for Solar Radiation Applications, Solar Energy. Vol. 76(5), 2004; pp. 577-589).

https://midcdmz.nrel.gov/spa/

Features

• Solar position (e.g. topocentric zenith and azimuth angles)
• Sunrise, sun transit and sunset times
• Equation of time

Usage

There is a trivial demo application: src/test/java/io/github/chuvoks/spademo/SPADemo.java

Maven

<dependency>
  <groupId>io.github.chuvoks</groupId>
  <artifactId>spa</artifactId>
  <version>1.0.0</version>
</dependency>