https://github.com/maltegrosse/go-solpos
Go adoption of NREL SOLPOS 2.0: Calculates the solar position and intensity based on location, date, and time inputs for the years 1950–2050.
https://github.com/maltegrosse/go-solpos
Last synced: 12 months ago
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Go adoption of NREL SOLPOS 2.0: Calculates the solar position and intensity based on location, date, and time inputs for the years 1950–2050.
- Host: GitHub
- URL: https://github.com/maltegrosse/go-solpos
- Owner: maltegrosse
- License: other
- Created: 2020-05-10T18:14:26.000Z (about 6 years ago)
- Default Branch: master
- Last Pushed: 2020-05-10T18:34:14.000Z (about 6 years ago)
- Last Synced: 2025-03-11T14:48:40.933Z (over 1 year ago)
- Language: Go
- Size: 19.5 KB
- Stars: 0
- Watchers: 1
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
Go-Solar Position and Intensity (SOLPOS)
=======================================
[](https://goreportcard.com/report/github.com/maltegrosse/go-solpos)
[](https://pkg.go.dev/github.com/maltegrosse/go-solpos)
NREL's Solar Position and Intensity (SOLPOS 2.0) C function (adopted in go lang) calculates the apparent solar position and intensity (theoretical maximum solar energy) based on date, time, and location on Earth for the years *1950–2050*.
## 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-solpos`
## Usage
You can find some examples in the [examples](examples) directory.
Please visit https://www.nrel.gov/grid/solar-resource/solpos.html for additional information.
Some additional helper functions have been added to the original application logic.
## Notes
Note that your final decimal place values may vary based on your computer's floating-point storage and your compiler's mathematical algorithms. If you agree with NREL's values for at least 5 significant digits, assume it works.
If the difference is smaller than 0.000001,it is shown as 0.
| | NREL | SOLPOS GO | Difference |
|---------------|-------|-------|-------|
| day | 22 | 22 | 0 |
| month | 7 | 7 | 0 |
| year | 1999 | 1999 | 0 |
| daynum | 203 | 203 | 0 |
| ampress | 1.326522 | 1.3265254683395031 | 0 |
| cosinc | 0.912569 | 0.9125697491698622 | 0 |
| prime | 1.037040 | 1.0370400228238181 | 0 |
| elevref | 48.409931 | 48.40974986370258 | 0.00018113629742089188 |
| etrtilt | 1207.547363 | 1207.5486465939166 | 0 |
| sbcf | 1.201910 | 1.2019108852729568 | 0 |
| sunrise | 347.173431 | 347.1746053157332 | 0 |
| sunset | 1181.111206 | 1181.1101930505447 | 0.0010129494553439145 |
| unprime | 0.964283 | 0.9642829379690094 | 0 |
| zenref | 41.590069 | 41.59025013629742 | 0 |
| amass | 1.335752 | 1.3357557648388834 | 0 |
| azim | 97.032875 | 97.03331438627943 | 0 |
| etr | 989.668518 | 989.6657077767151 | 0.0028102232848823405 |
| etrn | 1323.239868 | 1323.2398374944908 | 3.0505509130307473e-05 |
## License
**[ NREL data disclaimer](https://www.nrel.gov/disclaimer.html)**
Adoption in Golang under **[MIT license](http://opensource.org/licenses/mit-license.php)** 2020 © Malte Grosse.