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Go adoption of NREL's Solar and Moon Position Algorithm (SAMPA)

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Go-NREL's Solar and Moon Position Algorithm (SAMPA)

Go Report Card GoDoc Go

NREL's Solar and Moon Position Algorithm (SAMPA) calculates the solar and lunar zenith and azimuth angles in the period from the year -2000 to 6000, with uncertainties of +/- 0.0003 degrees for the Sun and +/- 0.003 degrees for the Moon, based on the date, time, and location on Earth. The algorithm can be used for solar eclipse monitoring and estimating the reduction in solar irradiance for many applications, such as smart grid, solar energy, etc.

(Reference: Reda, I. (2010). Solar Eclipse Monitoring for Solar Energy Applications Using the Solar and Moon Position Algorithms. 35 pp.; NREL Report No. TP-3B0-47681).

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-sampa

Usage

You can find some examples in the examples directory.

Please visit https://midcdmz.nrel.gov/sampa for additional information.

Some additional helper functions have been added to the original application logic.

Notes

NREL sampa_tester.c GO Sampa
Julian Day 2455034.564583 2455034.564583
L 299.4024 299.402381
B -0.00001308059 -0.000013080591
R 1.016024 1.016024218757
H 344.999100 344.999099851812
Delta Psi 0.004441121 0.004441121189
Delta Epsilon 0.001203311 0.001203311382
Epsilon 23.439252 23.439252167574
Zenith 14.512686 14.512686209564
Azimuth 104.387917 104.387916743210
Angular dist 0.374760 0.374759984176
Sun Radius 0.262360 0.262359778407
Moon Radius 0.283341 0.283341456977
Area unshaded 78.363514 78.363513779787
DNI 719.099358 719.099358263094

License

NREL SAMPA License

Adoption in Golang under MIT license 2020 © Malte Grosse.

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