Couples get married in all four seasons – Winter, Autumn, Spring and Summer.
Many want to have their ceremony at sunset. Or capture a romantic photo just
as the sun is going down  and the sky is alight with beautiful colors.

This (free) site: http://www.sunrisesunset.Com/calendar.asp can tell you
what time the sun rises and sets in your area on your wedding date.

Too, if you are into a moonlit night sky, it also shows the rise and size
of the moon on the day of your celebration.