National Daylight Appreciation Day is observed on June 21, coinciding with the summer solstice, which marks the longest day of the year. This day encourages individuals to appreciate the benefits of sunlight, such as mood enhancement and Vitamin D absorption. Typical customs include outdoor activities like yoga at sunrise, picnics featuring sun-themed foods, and swimming to soak up the rays. People are also encouraged to engage in creative activities like sidewalk art and to reflect on their gratitude for sunlight. The day serves as a reminder of the importance of natural light for health and well-being, as well as its role in reducing energy consumption. It highlights the historical significance of sunlight, dating back to ancient celebrations of the summer solstice.