Some events that signal the beginning of summer are:
It should be remembered that the seasons are diametrically opposed in the hemispheres.
When it is summer in the northern hemisphere it is winter in the southern one.
Seasons officially start and end on the solstices and equinoxes.
The solstices are the days on which daylight or night time are the longest. When the day is longest in the northern hemisphere night is longest in the southern.
The equinoxes are when day time and night time are equal which varies depending on your latitude. (Except at the equator)
The Summer Solstice in the northern hemisphere, where the sun is highest declination.
Maybe the right grammar there is 'at the beginning of summer'. Unless you are using a sentence with the phrase 'at the beginning of the summer vacation', that's when you're supposed to use 'the' before the word 'summer'.
the vernal equinox
The spring equinox
In the northern hemisphere it is the winter solstice that marks the start of winter.
Summer solstice.
Summer Solstice (A+ Anywhere)
winter solstice
The Summer Solstice in the northern hemisphere, where the sun is highest declination.
Uneven bars in artistic gymnastics
The Summer Solstice in the northern hemisphere, where the sun is highest declination.
Maybe the right grammar there is 'at the beginning of summer'. Unless you are using a sentence with the phrase 'at the beginning of the summer vacation', that's when you're supposed to use 'the' before the word 'summer'.
The calendar is intended to mark the number of years since the death of King Herod the Great. The Roman abbot Dionysus Exiguus devised the new Christian calendar in 533. He knew that it was impossible to say when Jesus was born, but he knew, or thought he knew, when Herod died. So, he chose to begin his Christian calendar on the year of Herod's death, and he based this on the reign of the Roman emperor Augustus. Unaware that Augustus only adopted that name four years after his reign began, going by his birth name of Octavius until then, Exiguus commenced his calendar just 4 years too late.
Vernal
autumnal equinox
The beginning of astronomical Summer in the nothern hemisphere is the moment when the center of the sun reaches the northernmost extent of the ecliptic in the sky, known as the solstice, on June 21 or 22.
It should be remembered that the seasons are diametrically opposed in the hemispheres. When it is summer in the northern hemisphere it is winter in the southern one. Seasons officially start and end on the solstices and equinoxes. The solstices are the days on which daylight or night time are the longest. When the day is longest in the northern hemisphere night is longest in the southern. The equinoxes are when day time and night time are equal which varies depending on your latitude. (Except at the equator)