Might be useful to have the slider cover 3 days, rather than just 24h. With the single day, New York visually looks to be ahead of London at certain times of da

Might be useful to have the slider cover 3 days, rather than just 24h. With the single day, New York visually looks to be ahead of London at certain times of day (e.g from 00:00 to 05:00 UK time), because NY is still in its previous day.