What is the period of diffused light before sunrise?

The period of diffused light before sunrise is known as twilight. This occurs in three phases: civil twilight, nautical twilight, and astronomical twilight, with civil twilight being the brightest and lasting until the sun is about 6 degrees below the horizon. During this time, natural light gradually increases, allowing for visibility even before the sun rises. The duration of twilight varies depending on geographical location and the time of year.