However, because of the tilt of the earth's axis of rotation, the times of sunrise and sunset vary from day to day, with the result that in the Northern Hemisphere there are long days and short nights in the summer and short days and long nights in the winter.
(the times of sunrise and sunset; vary; T:from day to day; with the result that in the Northern Hemisphere there are long days and short nights in the summer and short days and long nights in the winter)
the times of sunrise and sunset
vary
T:from day to day with the result that in the Northern Hemisphere there are long days and short nights in the summer and short days and long nights in the winter