So, in the summer, any location that's about 40 degrees north of the equator, like Hartford, Connecticut, will get 15 hours of daylight each day and 9 hours of darkness.
This is the 49th Parallel, the longest border between two countries anywhere in the world and the one that's most often thought of as being the dividing line between Canada and America.
To cope with the months of darkness at northern latitudes, the inside of a reindeer's eyes change from gold-colored in summer to blue in winter, which scatters more light onto their retina.
It was in 1862 that, in spite of the Southern Members of Congress, who wished a more southerly route, it was decided to lay the road between the forty–first and forty–second parallels.
Those living in regions with more tolerable conditions, especially nations in northern latitudes, will need to accommodate millions of migrants while themselves adapting to the demands of the climate crisis.