In the northern hemisphere, this marks the first day of summer and is the day with most hours of light in the year — when the Sun is farthest north. In the southern hemisphere, this is your winter solstice, marking the shortest day of the year.
In the northern hemisphere, this marks the first day of summer and is the day with most hours of light in the year — when the Sun is farthest north. In the southern hemisphere, this is your winter solstice, marking the shortest day of the year.