Felt like staying in bed longer this morning? It might be because the shorter days are affecting your circadian rhythm.

Friday is the longest day of the year north of the equator, where the solstice marks the start of astronomical summer.

Summer officially begins in the Northern Hemisphere on June 20 with the summer solstice, the day with the greatest amount of ...

The official marker of the summer season arrives tonight. It's the summer solstice, which has been celebrated for thousands of years.

Today may be the shortest day of the year across Australia. Here's why those hoping the worst of winter is behind them will ...

The first day of summer is marked by the summer solstice, or the longest day of the year. Here's what to know about summer ...

The Southern Hemisphere's winter solstice will occur on June 21. This marks Australia's shortest day and longest night of the ...