Your wallpaper adjusts to the current sun position of your location.
This mode reproduces the exact sun conditions according to when your photo was taken. It also takes the seasons into account, meaning: In winter, the wallpaper will automatically choose a lower sun than in summer.
The sun mode only works if GPS data is included in the Exif data of your images. The Dynamic Wallpaper Creator Engine automatically checks if the data is correctly included in your files.
If your GPS/Exif data is not correct you can use Adobe Bridge to check or add new meta-data. The important Exif meta-data for Dynamic Wallpapers are:
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DateTimeOriginal
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GPSLatitude
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GPSLongitude
There is also an online tool for adding GPS/EXIF data: https://thexifer.net/