[Historical note: The ending to the musical is stirring with them marching over the mountains. This did not happen and going over the mountains from Salzburg would take them into Germany! What really happened is that since Captain von Trapp had dual citizenship (Austrian & Italian) he had his family fled with day packs by taking the train to Italy. From there they made their way ultimately to England and eventually the United States. They were already a well known singing group before the Germain takeover of Austria, so they had contacts in Europe and America. They gave up everything to be free. After the war, they learned their home had been taken over by Heinrich Himmler. The house was donated to the Catholic Church and Captain Trapp helped his fellow Austrians with a relief fund, for which he is fondly remembered for.]
The Summer Solstice occurred back on June 21 where the North Pole tilts directly towards the sun making more sunlight the farther north above the equator you live. It typically means more warmer days and nights though that greatly depends on where you live. Some places are known for hot summers while others are known for more mild conditions. Now if you live closer to the North Pole (Alaska, parts of Canada, and Scandinavian countries)the sun literally never sets during this time of year. Of course the reverse is true in the Southern Hemisphere. They get less sunlight on the June Solstice and the closer you are to the Antarctic Circle means less sunlight or total night. For them, it is the Winter Solstice. It is hard to believe Australia, for instance, gets cold but they do get cooler days and nights during this time.