That's one way to do it in winter, if exactly 12 hour days suffice, and don't move too much. Manually adjusting the longitude every time I fly to the US would be a pain though.
What I'd really like is to tell it 'turn yourself off at sunrise, turn yourself on at sunset or 2100, whichever's later'.
What I'd really like is to tell it 'turn yourself off at sunrise, turn yourself on at sunset or 2100, whichever's later'.