Question

distinguish between dawn and twilight

Answer 1

Twilight is the name given to the period between dawn andsunrise, or between sunset anddusk, when light is still visible in the sky due to sunlight scattering off the atmosphere whereas dawn  is the time that marks the beginning of twilight before sunrise. It is recognized by the appearance of indirect sunlight being scattered in the atmosphere.

Answer 2

Twilight is the name given to the period between dawn and sunrise, or between sunset and dusk, when light is still visible in the sky due to sunlight scattering off the atmosphere. It can also be separated in astronomical, nautical and civil sections by how far below the horizon the Sun is.