In a post at Focus on Singh-Ray Filters, Steve Kossack writes:

“I have learned not to walk away from a Sierra sunset until well after the light has faded to almost complete darkness.”

I strongly share this point of view. I cannot tell you how many times I’ve been surprised by the most compelling evening light long after many other photographers have packed up their gear and left. While the warm “golden hour” light is indeed wonderful, all kinds of astonishing stuff can happen after the sun drops below the horizon. Sometimes the light shines upwards and suddenly illuminates high clouds; sometimes it takes on color casts are almost beyond belief; the colors often intensify and deepen; clouds and mist change form as the temperature drops; and on certain lucky occasions you may even begin to see some stars or planets in the sky.