Sunday is the longest day of the year for half the planet. A guide to the summer solstice

In the Northern Hemisphere, a significant seasonal event occurs. Astronomical summer begins, bringing the longest daytime period.

For areas north of the equator, this marks a change in seasons. The opposite is true in the Southern Hemisphere, where winter is starting.

Further information about this event can be found through NBC 5 Dallas-Fort Worth, including a guide to the summer solstice. Details are available for those looking to learn more about the significance of this day.