solarbg

Wallpaper changer utility which can change wallpaper by sun's altitude, and only on linux set gnome dynamic wallpapers(without smooth transitions). Available in AUR

1. Installation
2. Usage
3. Theme creation

Installation

If you are using Arch-based system you can install it from AUR

yay -S solarbg

Else you can install it via npm

npm i -g solarbg

Usage

Usage on Linux

solarbg [-m | --mode] [-t | --theme] [-l | --location]

Usage on Windows(mode is always solar)

solarbg [-t | --theme] [-l | --location]

Put your themes at

Linux: ~/.local/share/solarbg/themes/
Windows:C:\Users\(username)\AppData\Roaming\solarbg\themes\

Examples

Setting solar theme "Desert" and setting your latitude 40 and longitude 45.

solarbg --mode solar --location 40:45 --theme Desert 

Setting gnome dynamic wallpaper "Desert"

solarbg --mode gnome --theme Desert

Creating solar themes

1. Create a directory with your theme name in theme directory.
2. Put all your wallpaper there.
3. Create theme.json file in your theme directory
4. Here's expamle of theme.json:

[
        {
                "path": "0.png",
                "start": -90,
                "end": -5
        },
        {
                "path": "1.png",
                "start": -5,
                "end": 20
        },
        {
                "path": "2.png",
                "start": 20,
                "end": 40
        },
        {
                "path": "3.png",
                "start": 40,
                "end": 90
        },
        {
                "path": "3.png",
                "start": 90,
                "end": 20
        },
        {
                "path": "4.png",
                "start": 20,
                "end": -5
        },
        {
                "path": "0.png",
                "start": -5,
                "end": -90
        }
]

Where "path" is name of image file in the theme folder, "start" is sun's altitude when image is sets as wallpaper and "end" is sun's altitude when image stops to be wallpaper.

Just in case:
-90 altitude is absolute midnight.
from -12 to -6 is nautical twilight
from -6 to 0 is civil twilight
0 is sunrise or sunset
90 altitude is absolute noon