Magic happens within the blue hour.
The blue hour is the period of twilight when the sun is at a significant depth below the horizon. During this time, the remaining sunlight takes on a mostly blue shade. This shade differs from the color of the sky on a clear day.
Perfect picture moment.
The blue hour refers to the state of natural lighting that usually occurs around the nautical stage of the twilight period. That’s why hobby and professional photographers wait for this moment of magic to take their perfect picture.
Timing is everything.
The blue hour occurs when the sun is far enough below the horizon, allowing the sunlight's blue wavelengths to dominate due to the Chappuis absorption caused by ozone.