Well, it refers to the period of twilight each morning and evening where there is neither full daylight nor complete darkness. This is such a special time because of the quality of the light at this time of day.
The magic of this is that the blue hour isn't visible to the naked eye.
You can't really see it...but the camera can.
So how do you catch the blue hour in your photography since you can't see it with the naked eye? Knowing the time of day and also having another light source as in the candles on the table or a street light or the glow of city lights.
To learn more about this phenomenon, go to bluehoursite.com, and it will tell you the short period of time each morning and each evening in your area, when you should take photographs to get great blue hour pics. Here in south Atlanta area, the evening blue hour starts at 8:45-9:18 PM.
Special thanks to Susan at
for sharing this special magic of our day with us.