Daylight Appreciation Day is observed each year on June 21. Daylight Appreciation Day is sponsored by Solatube International, Inc., a manufacturer of Tubular Daylighting Devices. Daylight Appreciation Day is also a day to learn more about the importance of daylighting.
This day recognizes summer solstice (the longest day of daylight in the northern hemisphere) and encourages people to celebrate the many benefits of the sun. Daylighting is using skylights, windows and other architectural openings to natural light interior spaces. Doing so helps not only to reduce energy consumption but may also have health benefits.