I once departed Stockholm on Jan 1st, flying to San Francisco. The route goes north, across the polar circle and over Greenland, then south towards the US west coast. As we passed the polar circle, the sun set. A few hours later, we passed it again and the sun rose, only to set again as we approached the evening in US. So I got two sunrises, two days and two sunsets that single day, which I thought was so wonderful I still remember it.