In some cases, they helped frame the scene. Wednesday’s sunset was the last one of the season to occur before 5 p.m., and Thursday’s will be the first at 5 p.m. or later since Nov. 8.

There are many factors that can add to a vibrant sunset, and winter lends itself to these conditions. Here's a look at the science behind the perfect sunset.

It might surprise you to learn the earliest sunset of the year is not on Dec. 21, the winter solstice and the “shortest” day of the year.

There are many factors that can add to a vibrant sunset, and winter lends itself to these conditions. Here's a look at the science behind the perfect sunset.