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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
That's a neat idea - yes, it should be possible. Although most people won't have their GPS on most of the time so I don't know how useful it'd be unless it remembered the last known position.
I'd imagine there's some JS out there that'll take lat/lon and time and give you sunrise/sunset... It can't be too painful