USA HISTORY

Detailed explanation-1: -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.

Detailed explanation-2: -Dawn is the time of morning when the Sun is 6° below the horizon. Respectively, dusk occurs when the Sun is 6° below the horizon in the evening. Sunrise is the time when the first part of the Sun becomes visible in the morning at a given location.

Detailed explanation-3: -(idiomatic) A new beginning; a fresh start; an important, promising turning point.

Detailed explanation-4: -It occurs the moment the disc of sun completely disappears below the western horizon. Technically, “dusk” is the period of twilight between complete darkness and sunrise (or sunset). In common usage, “dawn” refers to morning, while “dusk” refers only to the evening twilight.

Detailed explanation-5: -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.