The Blue Hour is a classic time of day for landscape photographers to photograph. There are in fact two blue hours and both don't necessarily last for an hour.
The first blue hour precedes sunrise and the second of the day comes after sunset; wrapped inside the day there is also the golden hour that we will talk about separately.
During the evening blue hour - light is fading, the sun has set and we lose the direct brightness from our light-giving star.
Red light passes through Earth's atmosphere and further into space, while blue light with its shorter wavelength gets trapped and scattered, and bounces around to create a blue coloured period we call the Blue Hour.
I have written about blue hour images here on panoramicireland.com before here, and here write about sunrise and sunset photography.
As seen in this image, the blue hour is approaching as the sun has set with only a small portion of the western sky alight with Golden Hour light.
Silhouettes and shadows become prominent at this time of day, needless to say the sky is an important part of a blue hour image.
More Blue Hour images to come and to join me, Panoramic Ireland, on a landscape photography workshop in Ireland's west contact me.