Civil Twilight Duration (sunset to solar depression 6°) at the Prime Meridian, Sea Level, Northern Hemisphere (March 1, 2007 to March 31, 2008) Mar 1 Mar 15 Mar 29 Apr 12 Apr 26 May 10 May 24 7 Jun 21 Jun Jul 5 Jul 19 Aug 2 Aug 16 Aug 30 Sep 13 Sep 27 11 Oct 25 Oct Nov 8 Nov 22 Dec 6 Dec 20 Jan 3 Jan 17 Jan 31 14 Feb 28 Feb Mar 13 Mar 27 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 Civil Twilight Duration (daytime temporal minutes after sunset) after minutes temporal (daytime Duration Civil Twilight 23.5° N 30° N 100 40° N 45° N 105 50° N 55° N 58° N 59° N 110 60° N 61° N Northward Equinox North Solstice 115 Southward Equinox South Solstice 120 Analysis by Dr. Irv Bromberg, University of Toronto, Canada http://www.sym454.org/twilight/ Civil Twilight Duration (sunset to solar depression 6°) at the Prime Meridian, Sea Level, Southern Hemisphere (March 1, 2007 to March 31, 2008) Mar 1 Mar 15 Mar 29 Apr 12 Apr 26 May 10 May 24 7 Jun 21 Jun Jul 5 Jul 19 Aug 2 Aug 16 Aug 30 Sep 13 Sep 27 11 Oct 25 Oct Nov 8 Nov 22 Dec 6 Dec 20 Jan 3 Jan 17 Jan 31 14 Feb 28 Feb Mar 13 Mar 27 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 23.5° S 30° S Civil Twilight Duration (daytime temporal minutes after sunset) after minutes temporal (daytime Duration Civil Twilight 100 40° S 45° S 50° S 55° S 105 58° S 59° S 110 60° S 61° S Northward Equinox North Solstice 115 Southward Equinox South Solstice 120 Analysis by Dr. Irv Bromberg, University of Toronto, Canada http://www.sym454.org/twilight/ Nautical Twilight Duration (sunset to solar depression 12°) at the Prime Meridian, Sea Level, Northern Hemisphere (March 1, 2007 to March 31, 2008) Mar 1 Mar 15 Mar 29 Apr 12 Apr 26 May 10 May 24 7 Jun 21 Jun Jul 5 Jul 19 Aug 2 Aug 16 Aug 30 Sep 13 Sep 27 11 Oct 25 Oct Nov 8 Nov 22 Dec 6 Dec 20 Jan 3 Jan 17 Jan 31 14 Feb 28 Feb Mar 13 Mar 27 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 23.5° N 130 30° N 35° N 135 38° N 140 40° N 145 42° N 150 45° N Nautical Twilight Duration (daytime temporal minutes after sunset) after minutes temporal (daytime Duration Twilight Nautical 49° N 155 52° N 160 54° N 165 Northward Equinox North Solstice 170 Southward Equinox 175 South Solstice 180 Analysis by Dr. Irv Bromberg, University of Toronto, Canada http://www.sym454.org/twilight/ Nautical Twilight Duration (sunset to solar depression 12°) at the Prime Meridian, Sea Level, Southern Hemisphere (March 1, 2007 to March 31, 2008) Mar 1 Mar 15 Mar 29 Apr 12 Apr 26 May 10 May 24 7 Jun 21 Jun Jul 5 Jul 19 Aug 2 Aug 16 Aug 30 Sep 13 Sep 27 11 Oct 25 Oct Nov 8 Nov 22 Dec 6 Dec 20 Jan 3 Jan 17 Jan 31 14 Feb 28 Feb Mar 13 Mar 27 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 23.5° S 130 30° S 35° S 135 38° S 140 40° S 145 42° S 150 45° S Nautical Twilight Duration (daytime temporal minutes after sunset) after minutes temporal (daytime Duration Twilight Nautical 49° S 155 52° S 160 54° S 165 Northward Equinox North Solstice 170 Southward Equinox 175 South Solstice 180 Analysis by Dr. Irv Bromberg, University of Toronto, Canada http://www.sym454.org/twilight/ Astronomical Twilight Duration (sunset to solar depression 18°) at the Prime Meridian, Sea Level, Northern Hemisphere (March 1, 2007 to March 31, 2008) Mar 1 Mar 15 Mar 29 Apr 12 Apr 26 May 10 May 24 7 Jun 21 Jun Jul 5 Jul 19 Aug 2 Aug 16 Aug 30 Sep 13 Sep 27 11 Oct 25 Oct Nov 8 Nov 22 Dec 6 Dec 20 Jan 3 Jan 17 Jan 31 14 Feb 28 Feb Mar 13 Mar 27 70 75 80 85 90 95 100 105 110 115 120 e temporal minutes after sunset) 125 130 135 140 145 150 155 160 23.5° N 30° N Astronomical Twilight Duration (daytim 35° N 38° N 165 40° N 42° N 44° N 46° N 170 47° N 49° N 175 Northward Equinox North Solstice Southward Equinox South Solstice 180 Analysis by Dr. Irv Bromberg, University of Toronto, Canada http://www.sym454.org/twilight/ Astronomical Twilight Duration (sunset to solar depression 18°) at the Prime Meridian, Sea Level, Southern Hemisphere (March 1, 2007 to March 31, 2008) Mar 1 Mar 15 Mar 29 Apr 12 Apr 26 May 10 May 24 7 Jun 21 Jun Jul 5 Jul 19 Aug 2 Aug 16 Aug 30 Sep 13 Sep 27 11 Oct 25 Oct Nov 8 Nov 22 Dec 6 Dec 20 Jan 3 Jan 17 Jan 31 14 Feb 28 Feb Mar 13 Mar 27 70 75 80 85 90 95 100 105 110 115 120 e temporal minutes after sunset) 125 130 135 140 145 150 155 160 Astronomical Twilight Duration (daytim 23.5° S 30° S 165 35° S 38° S 40° S 42° S 170 44° S 46° S 47° S 49° S 175 Northward Equinox North Solstice Southward Equinox South Solstice 180 Analysis by Dr. Irv Bromberg, University of Toronto, Canada http://www.sym454.org/twilight/.