Go
this script uses ipgeolocation.io to get the sunrise and sunset dates for you approximate location based on your IP address. The api requires an API-key that can be acquired from the website for free. since the script queries the data only one per day you won't exceed the free plan ;).
to use the compiled version do go build -o sunbar.1m.cgo and move it to you plugin folder. alternatively move the go sourcecode file to the plugin directory.