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When the Sun is 18 degrees below the horizon.

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11y ago

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How can you tell the difference between astronomical twilight and night?

Here's the formula: From sunset until the Sun is six degrees below the horizon is civil twillight. It's still light enough to read. When the Sun is six to twelve degrees below the horizon is nautical twilight. One can still see the horizon at sea; that is, tell when the sea stops and the sky starts. From twelve to eighteen degrees is astronomical twilight, which is when the stars start to come out. After the Sun is more than eighteen degrees below the horizon, it's officially Night.


Does astronomical twilight end and night begin near the summer solstice in London or is that too far north?

Astronomical twilight lasts all night in London during the summer solstice, however due to the urban light pollution it is hardly noticeable.


Does it get darker than astronomical twilight at night in every Northern Hemisphere location south of the Arctic Circle in December?

Yes, absolutely. At the Arctic Circle in December, it barely gets LIGHT enough to be astronomical twilight. Then it gets dark again.


What is the definition of twilight?

Twilight is the time of day that falls between sunrise, or sunset, and full night.


Is dusk twilight?

Twilight is the half-light between night and day. Twilight occurs a dusk and also t dawn.


Is London England far enough south to get a completely dark sky - without astronomical twilight lasting all night near the summer solstice?

No.


What is the word for the time between afternoon and night?

It is twilight or dusk


Simple Question - Is there anywhere in England where astronomical twilight ends at night near June 21st?

No it only happens south of 48½ degrees north latitude.


What is the line between day and night called?

The line dividing illuminated areas from night areas is called the terminator.


What is the difference between polar night and twilight?

Polar night occurs when the sun doesn't rise above the horizon for 24 hours, creating continuous darkness. Twilight, on the other hand, is the period before sunrise and after sunset when the sky is partially illuminated.


Give you a list of words that describe the time of day?

day night midnight noon astronomical twilight nautical twilight civil twilight sunrise sunset moonrise moonset morning afternoon evening ante meridiem (AM) post meridiem (PM) o'clock dawn dusk


What is the time between day and night called?

The transition time between day and night is called twilight. This is when the sky gradually changes color as the sun sets or rises, creating a period of low light levels.