Dawn occurs before sunrise, before the top of the Sun reaches the horizon. Astronomical Dawn is the point at which it becomes possible to detect light in the sky, when the sun is 18° below the horizon.

What time period is dawn?

Dawn is the time that marks the beginning of twilight before sunrise. It is recognized by the appearance of indirect sunlight being scattered in Earth's atmosphere, when the centre of the Sun's disc has reached 18° below the observer's horizon.

Is dawn at the beginning of the day?

The noun dawn refers to the first light of day, or the first time period, like the dawn of a new era, which occurs when a new president takes office. Not just the beginning of a day, the noun dawn can refer to any beginning, like the dawn of the Internet era.