This was a weekend of the Sun and Moon -- a coincidence of the summer solstice and the "Supermoon". Friday was the summer solstice (in the northern hemisphere), welcomed by humans for thousands of years as the longest day of the year. In ancient times, people celebrated this day as the center point of summer. Some still observe the solstice with ceremonies and prayers, gathering on mountaintops or at spiritual landmarks. Over the weekend, skywatchers around the world were also treated to views of the so-called Supermoon, the largest full moon of the year. On Sunday, the moon approached within 357,000 km (222,000 mi) of Earth, in what is called a perigee-syzygy of the Earth-Moon-Sun system (perigee: closest point of an elliptical orbit; syzygy: straight line made of three bodies in a gravitational system). Photographers across the globe set out to capture both events, and collected here are 24 images of our two most-visible celestial neighbors.