For most of history, man's days and years were governed by the sun and stars. Even after clocks and watches were invented, they were set by the sun so that they read noon when the sun was at its zenith. Time is now delivered to us by the radio and television and told by the digital watch.
Morning is when the alarm goes off.
Summer is when you need the air conditioner. We know about satellites, galaxies, planets and black holes, but have lost touch with the logic and rhythm of sunrise, sunset, summer and winter. These things used to be understood intuitively by everybody, and their rules and special terminology were a part of the intellectual baggage of all well-educated people. Midsummer's day was celebrated at the summer solstice on June 21. Christmas is close to the Winter solstice on December 22.