Be happy and celebrate, the first day of the summer season (starts from June 20th to 21st in the United States and the rest of the northern hemisphere). The declination of the Sun on the Summer Solstice is known as the tropic of cancer (23° 27′).  In the southern hemisphere, winter and summer solstices are exchanged so that the Summer Solstice is the day on which the Sun is farthest south. today is one the happiest days of the year. More people are happy today than any other day. The summer months stretch out before us. One can only hope that the summer weather will follow. Today looks promising for FUN DAY.