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Sky Maps: Your Sky, Heavens-above Longitude and Latitude: Martinsville, NJ: LAT: 40° 35' 00 N: LON 74° 32 37 W - EST=UTC-5, EDT=UTC-4 Boston, MA: LAT: 42° 21'24" N LON: 71° 3'24"W Homewood, CA: LAT: 39° 5' N LON: 120° 10' PST=UTC-8, PDT=UTC-7 Clair Tappaan Ldge: LAT: 39° 19' N LON: 120° 22' PST=UTC-8, PDT=UTC-7 Davis, CA: Lat: 38° 33' 17" N Lon: 121° 45' 45" W
Astronomical dawn is the time at which the sun is 18 degrees below the horizon in the morning. Astronomical dawn is that point in time at which the sun starts lightening the sky. Prior to this time, the sky is completely dark.
Nautical dawn is the time at which the sun is 12 degrees below the horizon in the morning. Nautical dawn is defined as that time at which there is just enough sunlight for objects to be distinguishable. Sometimes known as "frist light".
Dawn or civil dawn is the time at which the sun is 6 degrees below the horizon in the morning. Civil dawn is defined as that time at which there is enough light for objects to be distinguishable and that outdoor activities can commence.
Twilight is the time between the above.
Dusk is the evening equivalent of dawn.
In New York City (Lat: 40° 43')
June 21 EDT
Dec. 21: EST
Length of twilight (Time between Civil Dawn and Sunrise) at:
Hawaii does not observe daylight savings.
Times above are computed for the Winter Solstice (usually Dec 21 or 22) and Summer Solstice (longest day) June 20 or 21st and Spring Equinox (Mar 20 or 21) and Fall Equinox (Sep. 22 or 23).
The solstice is not the day when the sun rises earliest in the morning nor when it sets latest at night. This varies by location.
For Miami the earliest sunrise (5:41) occurs between June 11-14.
Universal Time (UT) Table (UT is the time in the Greenwich time zone which used to be called Grenwich Mean Time)
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