This Friday, June 21, marks the beginning of summer. But, how is that determined?
The Earth's axis is tilted at a 23.5 degree angle, which means that throughout the year, different locations experience different seasons and weather conditions.
The Northern Hemisphere, which Lancaster County is in, reaches peak closeness to the sun June 21.
The length of daytime for the longest day of summer depends on how close a respective area is to the North Pole, which receives 24 hours of sunlight, and the Equator, which receives less than 14 hours of sunlight.
During the summer solstice, Pennsylvania will see anywhere from 15 to 15.5 hours of sunlight, according to the National Oceanic and Atmospheric Administration (NOAA).
Sunset will be anywhere from 8:30 to 9 p.m. Friday.
The amount of daylight will decrease by day until the winter solstice, December 21, 2019.