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Civil Twilight: Practical Twilight
“The length of twilight is an element useful to be known: by prolonging the day, it permits the continuance of labor.”
-French physicist Auguste Bravais
Civil twilight occurs when the sun is less than 6 degrees below the horizon
CIVIL DAWN
In the morning it begins when the center of the sun is 6 degrees below the horizon; ends at sunrise
CIVIL DUSK
In the evening, it begins at sunset; ends when the center of the sun is 6 degrees below the horizon
Civil twilight is the brightest form of twilight. There is enough natural sunlight that artificial light may not be required to carry out outdoor activities
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TWILIGHT: Half-light
- from Old English twi- ‘two’ (used in an obscure sense) + light (English) = twilight (late middle English)
-OxfordLanguages
- literally 'second light, half-light'
--wiktionary
Twilight occurs when Earth's upper atmosphere scat...
4
90 reads
Nautical Twilight
This period is less bright than civil twilight.Artificial light is needed for outdoor activities
Nautical twilight occurs when the center of the sun is between 6 and 12 degrees below the horizon
Nautical dawn is the time when the sun is 12 degrees below the horizon in the morning.
3
54 reads
CURATED FROM
CURATED BY
Jack of all people-related trades, master of none. Majored in Psychology, Customer Service Assoc for a few Years, HR Officer for 4, Manager and ESL Teacher for over 11 yrs now, an artist since birth.
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Nautical Twilight
This period is less bright than civil twilight.Artificial light is needed for outdoor activities
Nautical twilight occurs when the center of the sun is between 6 and 12 degrees below the horizon
Nautical dawn is the time when the sun is 12 degrees below the horizon in the morning.
TWILIGHT: Half-light
- from Old English twi- ‘two’ (used in an obscure sense) + light (English) = twilight (late middle English)
-OxfordLanguages
- literally 'second light, half-light'
--wiktionary
Twilight occurs when Earth's upper atmosphere scat...
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