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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.

Twilight - Wikipedia

Added by Trav Fryer
Updated a year ago

The blue hour (from French l'heure bleue ) is a period of twilight in the morning and in the evening, during the civil and nautical twilight phases, when the Sun is at a significant depth below the horizon and when the residual, indirect sunlight takes on a predominantly blue shade.

Blue hour - Wikipedia

Added by Trav Fryer
Updated a year ago

Alpenglow (from German: Alpenglühen, Italian: Enrosadira) is an optical phenomenon that appears as a horizontal reddish glow near the horizon opposite of the Sun when the solar disk is just below the horizon. This effect is easily visible when mountains are illuminated, but can also be seen when clouds are lit through backscatter.

Alpenglow - Wikipedia

Added by Trav Fryer
Updated a year ago

Like alpenglow, the backscatter of reddened sunlight also creates the Belt of Venus. Unlike the Belt of Venus, the direct illumination of clouds and aerosols that create the afterglow, which characterizes alpenglow, hover low in the atmosphere and create a red horizontal band visible soon after sunset or before sunrise.

Belt of Venus - Wikipedia

Added by Trav Fryer
Updated a year ago

Where artificial lighting is used, this has to be sufficient to not only illuminate the task area, but also provide sufficient background lighting to avoid a sensation of gloominess which has a negative effect on efficiency. If the task is challenging, such as playing cricket, reaction times are found to increase significantly when the illumination declines to the gloom level.

Gloom - Wikipedia

Added by Trav Fryer
Updated a year ago

The polar night occurs in the northernmost and southernmost regions of the Earth when the night lasts for more than 24 hours. This occurs only inside the polar circles. The opposite phenomenon, the polar day, or midnight sun, occurs when the Sun stays above the horizon for more than 24 hours.

Polar night - Wikipedia

Added by Trav Fryer
Updated a year ago

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