Question

Write short notes on dawn ,noon and twilight

Answer 1

Dawn (from an Old English verb dagian "to become day") is the time that marks, depending on the specific usage, the beginning of the twilight before sunrise, the period of the pre-sunrise twilight or the time of sunrise. When identified as the beginning of or the period of twilight, it is recognized by the presence of weak sunlight, while the Sun itself is still below the horizon.
Sunrise or sun up is the instant at which the upper edge of the Sun appears over the horizon in the morning. The term can also refer to the entire process of the Sun crossing the horizon and its accompanying atmospheric effects.
Twilight on Earth is the illumination of the lower atmosphere when the Sun itself is not directly visible because it is below the horizon. Twilight is produced by sunlight scattering in the upper atmosphere, illuminating the lower atmosphere so that Earth's surface is neither completely lit nor completely dark. The word twilight is also used to denote the periods of time when this illumination occurs.

Answer 2

Answer:

Respectively, dusk occurs when the geometric center of the Sun is 18° below the horizon in the evening.Twilight refers to the periods between the dawn and sunrise and sunset and dusk, where sunrise and sunset are defined as the exact times when the upper edge of the disc of the Sun is at the horizon.

Explanation:

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