Traditionally, Earth religions consider the major Sabbaths to be the changes of the seasons, however each of the minor Sabbaths have meaning of their own, like the summer solstice being the one day of the year with the longest period of daylight.
(the summer solstice; being; the one day of the year with the longest period of daylight)
the summer solstice
being
the one day of the year with the longest period of daylight