Artists have sought to capture the perfect blue of a summer sky or the fiery red of a sunset. The scientific explanation of why the sky is blue adds another layer of wonder. It revealsnot just the ...

This year, the first day of Northern Hemisphere summer arrives on June 21 at 9:58 a.m. On this day, the Sun appears highest in our midday sky for the entire year: 68.6 degrees above the horizon ...