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What is the northernmost latitude that can experience twilight between sunset and astronomical dusk on a single date of the year?
DiamondXmas
That is called The midnight sun which is a natural phenomenon occurring in summer months at places north of the Arctic Circle and south of the Antarctic Circle where the sun remains visible at the local midnight, around the solstice, June 21 in the north and December 21 in the south, and given fair weather the sun is visible for the full 24 hours.
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What is the cutoff - southernmost - latitude for astronomical dusk - start of twilight - near the summer solstice?
At the summer solstice the sun sets on the northern horizon at latitude 66.6 degrees north. At the same time astronomical twilight ends only at latitudes below 48.6 degrees north. It's 66.6 minus 18 because for astronomical twilight to end the Sun's centre must be 18 degrees below the horizon.
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.
Does latitude affect how dark it gets?
No, but latitude affects how long it stays dark. For example: At 90 degrees latitude, either north or south, the sun will set and stay down for 6 months, then will rise and stay up for the next 6 months. Yes, latitude indeed affects how dark it gets. For example north of the Arctic Circle there is no night or even twilight and latitudes slightly below the Arctic Circle experience a night-long twilight.
Does it get darker than astronomical twilight in London England on nights near the June solstice?
Wikipedia sez: "Astronomical twilight is defined to begin in the morning, and to end in the evening when the center of the Sun is geometrically 18 degrees below the horizon." London, England is at 51 degrees north latitude. At midnight in the June Solstice, the Sun is at a declination of 23.5 degrees (approximately), so the over-the-pole angular distance is (90-51) + (90-23.5) degrees, or 105 degrees. The horizon is 90 degrees, so the Sun is 15 degrees below the northern horizon at midnight on June 21. So, no, it won't meet the definition for "darker than astronomical twilight".
Is London England far enough south to get a completely dark sky - without astronomical twilight lasting all night near the summer solstice?
No.
Does the sky get darker than astronomical twilight on dates near the June solstice in Munich Germany disregarding light pollution?
No, astronomical twilight is the darkest stage of twilight where the Sun is between 12 and 18 degrees below the horizon. Near the June solstice in Munich, there may be some residual light in the sky even during astronomical twilight due to the high latitude of the location. The sky may not get significantly darker than astronomical twilight on those dates.
What is the cutoff - southernmost - latitude for astronomical dusk - start of twilight - near the summer solstice?
At the summer solstice the sun sets on the northern horizon at latitude 66.6 degrees north. At the same time astronomical twilight ends only at latitudes below 48.6 degrees north. It's 66.6 minus 18 because for astronomical twilight to end the Sun's centre must be 18 degrees below the horizon.
Does it get darker than astronomical twilight in Newcastle-upon-Tyne England in June?
No because the latitude is 55 degrees N so the Sun never goes more than 11½ degrees below the northern horizon, so nautical twilight and astronomical twilight do not end.
Between which two dates of the year does it never get darker than astronomical twilight at the latitude of the Arctic Circle?
April 3 and September 8
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.
Does astronomical twilight end on nights near the summer solstice in Southampton England UK?
Astronomical twilight does not end on nights near the summer solstice in Southampton, England.
Does latitude affect how dark it gets?
No, but latitude affects how long it stays dark. For example: At 90 degrees latitude, either north or south, the sun will set and stay down for 6 months, then will rise and stay up for the next 6 months. Yes, latitude indeed affects how dark it gets. For example north of the Arctic Circle there is no night or even twilight and latitudes slightly below the Arctic Circle experience a night-long twilight.
What is the difference between astronomical twilight and night?
When the Sun is 18 degrees below the horizon.
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.
Are there any places in Great Britain where astronomical twilight ends near the summer solstice?
No. For any location in England, on June 21, the Sun is never more than 18 degrees below the horizon, which is the definition of "astronomical twilight". If by "Great Britain" you mean to included British colonies and possessions, then yes; places like Gibraltar and Bermuda are far enough south so that the do experience complete darkness at 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 in London England on nights near the June solstice?
Wikipedia sez: "Astronomical twilight is defined to begin in the morning, and to end in the evening when the center of the Sun is geometrically 18 degrees below the horizon." London, England is at 51 degrees north latitude. At midnight in the June Solstice, the Sun is at a declination of 23.5 degrees (approximately), so the over-the-pole angular distance is (90-51) + (90-23.5) degrees, or 105 degrees. The horizon is 90 degrees, so the Sun is 15 degrees below the northern horizon at midnight on June 21. So, no, it won't meet the definition for "darker than astronomical twilight".
