https://github.com/maltegrosse/go-spa
Go adoption of NREL's Solar Position Algorithm (SPA), which calculates the solar zenith and azimuth angles in the period from the year -2000 to 6000
https://github.com/maltegrosse/go-spa
Last synced: about 2 months ago
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Go adoption of NREL's Solar Position Algorithm (SPA), which calculates the solar zenith and azimuth angles in the period from the year -2000 to 6000
- Host: GitHub
- URL: https://github.com/maltegrosse/go-spa
- Owner: maltegrosse
- License: other
- Created: 2020-05-11T19:30:25.000Z (about 6 years ago)
- Default Branch: master
- Last Pushed: 2020-05-11T19:34:11.000Z (about 6 years ago)
- Last Synced: 2025-03-11T14:48:38.099Z (over 1 year ago)
- Language: Go
- Homepage:
- Size: 15.6 KB
- Stars: 1
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
Go-Solar Position Algorithm (SPA)
=======================================
[](https://goreportcard.com/report/github.com/maltegrosse/go-spa)
[](https://pkg.go.dev/github.com/maltegrosse/go-spa)
NREL's Solar Position Algorithm (SPA) 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).
## Installation
This packages requires Go 1.13. If you installed it and set up your GOPATH, just run:
`go get -u github.com/maltegrosse/go-spa`
## Usage
You can find some examples in the [examples](examples) directory.
Please visit https://midcdmz.nrel.gov/spa/ for additional information.
Some additional helper functions have been added to the original application logic.
## Notes
| | NREL spa_tester.c | SPA GO |
|---------------|-------|-------|
| Julian Day | 2452930.312847 | 2452930.312847 |
| L | 24.01826 | 24.018262 |
| B | -0.0001011219 | -0.000101121925 |
| R | 0.996542 | 0.996542 |
| H | 11.105902 | 11.105902 |
| Delta Psi | -0.003998404 | -0.003998404303 |
| Delta Epsilon | 0.001666568 | 0.001666568177 |
| Epsilon | 23.440465 | 23.440465 |
| Zenith | 50.111622 | 50.111622 |
| Azimuth | 194.340241 | 194.340241 |
| Incidence | 25.187000 | 25.187000 |
| Sunrise | 2003-10-17 06:12:43 | 2003-10-17 06:12:43 |
| Sunset | 2003-10-17 17:20:19 | 2003-10-17 17:20:19 |
## License
**[NREL SPA License](https://midcdmz.nrel.gov/spa/#license)**
Adoption in Golang under **[MIT license](http://opensource.org/licenses/mit-license.php)** 2020 © Malte Grosse.