Using GPS for telling sun rise and sun set?

Thanks @BenJabituya.
Looking at your very cool clock, I assume that you are getting the GPS (when not already saved) from ...

Bangle.on('GPS', function (g) {
    if (g.fix) {
        astral_settings.lat = g.lat;
        astral_settings.lon = g.lon;
        astral_settings.astral_default = false;
        config_file = require("Storage").open("astral.config.txt", "w");
        config_file.write(JSON.stringify(astral_settings));
    }

I have never worked with bangles GPS so trying to workout the best way to call the lat/lon without scrwing something up and calling the GPS all the time or something lol