https://github.com/klausbrunner/gosolarpos

Package gosolarpos contains functions to find topocentric solar coordinates, i.e. the sun’s position on the sky at a given date, latitude, and longitude (and other parameters).
https://github.com/klausbrunner/gosolarpos

golang solar sun

Last synced: 4 months ago
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Package gosolarpos contains functions to find topocentric solar coordinates, i.e. the sun’s position on the sky at a given date, latitude, and longitude (and other parameters).

• Host: GitHub
• URL: https://github.com/klausbrunner/gosolarpos
• Owner: klausbrunner
• License: mit
• Created: 2015-07-01T15:12:31.000Z (almost 11 years ago)
• Default Branch: master
• Last Pushed: 2023-03-22T06:59:35.000Z (about 3 years ago)
• Last Synced: 2024-06-20T15:07:23.245Z (almost 2 years ago)
• Topics: golang, solar, sun
• Language: Go
• Homepage:
• Size: 22.5 KB
• Stars: 12
• Watchers: 3
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.txt

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README

          
gosolarpos

==========

![](https://github.com/klausbrunner/gosolarpos/workflows/Go/badge.svg)

Package gosolarpos contains functions to find topocentric solar coordinates, i.e. the sun’s position on the sky at a given date, latitude, and longitude (and other parameters).

This is a partial Golang port of https://github.com/klausbrunner/solarpositioning. Currently, only the [Grena/ENEA](http://dx.doi.org/10.1016/j.solener.2012.01.024) #3 algorithm is included - which should be fine for most applications, and preferable to many of the unattributed sun position calculation snippets floating around the Web.

Usage

-----

To use this module:

```Go

import (

    "github.com/klausbrunner/gosolarpos"

)

azimuthDegrees, zenithDegrees := gosolarpos.Grena3(time.Now(),

		52.521667, // latitude (degrees)

		13.413333, // longitude (degrees)

		68,        // Delta T (s) - if unknown, use EstimateDeltaT()

		1000,      // air pressure (hPa)

		20)        // air temperature (°C)

println(azimuthDegrees, zenithDegrees)

```

A simple CLI is also available:

```console

$ cd cmd/sol

$ go install

$ sol --lat 48.266667 --lon -116.566667                 

 using current time: 2023-01-22 09:46:27.86356 +0100 CET m=+0.000386917

 estimating delta-T: 70.81

 using standard sea-level pressure: 1013.25 hPa

azimuth: 23.252482°   zenith: 149.786614°

```