Arctic Circle and Antarctic Circle latitudes 2021 +/-.
Arctic Circle latitudes for the years 2000-2049, every 10 days. They are also suitable for the Antarctic Circle.
This page the year 2021, every 10 days. See subpages at the bottom of this page for more years:
"The table (NAPA2050) was calculated by Prof. Markku Poutanen (Finnish Geodetic Institute) using software written by Dr. Matti Ollikainen (already retired from FGI)."
"The used nutation formulas are taken from The Astronomical Almanac 1984, PP S23-26. The Improved IAU system)".
A copy was sent to me from the National Land Survey of Finland:
Latitude and movement of the Arctic Circle
Since [year,month,day,h,m,s]: 2000 1 1 0 0 0
Until [year,month,day,h,m,s]: 2050 1 1 0 0 0
Date UT B.Y Latitude Days Movement
Y M D H Min Sec (metres, meters)
2021 1 10 0 0 .00 2021.03 66 33 46.963 7680.00 82.0
2021 1 20 0 0 .00 2021.05 66 33 46.585 7690.00 70.3
2021 1 30 0 0 .00 2021.08 66 33 46.393 7700.00 64.4
2021 2 9 0 0 .00 2021.11 66 33 46.235 7710.00 59.5
2021 2 19 0 0 .00 2021.14 66 33 45.886 7720.00 48.7
2021 3 1 0 0 .00 2021.16 66 33 45.551 7730.00 38.3
2021 3 11 0 0 .00 2021.19 66 33 45.488 7740.00 36.3
2021 3 21 0 0 .00 2021.22 66 33 45.500 7750.00 36.7
2021 3 31 0 0 .00 2021.25 66 33 45.340 7760.00 31.7
2021 4 10 0 0 .00 2021.27 66 33 45.310 7770.00 30.8
2021 4 20 0 0 .00 2021.30 66 33 45.574 7780.00 39.0
2021 4 30 0 0 .00 2021.33 66 33 45.706 7790.00 43.1
2021 5 10 0 0 .00 2021.36 66 33 45.667 7800.00 41.9
2021 5 20 0 0 .00 2021.38 66 33 45.808 7810.00 46.2
2021 5 30 0 0 .00 2021.41 66 33 46.004 7820.00 52.3
2021 6 9 0 0 .00 2021.44 66 33 46.002 7830.00 52.2
2021 6 19 0 0 .00 2021.47 66 33 45.832 7840.00 47.0
2021 6 29 0 0 .00 2021.49 66 33 45.800 7850.00 46.0
2021 7 9 0 0 .00 2021.52 66 33 45.809 7860.00 46.3
2021 7 19 0 0 .00 2021.55 66 33 45.504 7870.00 36.8
2021 7 29 0 0 .00 2021.57 66 33 45.169 7880.00 26.4
2021 8 8 0 0 .00 2021.60 66 33 45.068 7890.00 23.3
2021 8 18 0 0 .00 2021.63 66 33 44.887 7900.00 17.7
2021 8 28 0 0 .00 2021.66 66 33 44.512 7910.00 6.1
2021 9 7 0 0 .00 2021.68 66 33 44.284 7920.00 -1.0
2021 9 17 0 0 .00 2021.71 66 33 44.287 7930.00 -0.9
2021 9 27 0 0 .00 2021.74 66 33 44.238 7940.00 -2.4
2021 10 7 0 0 .00 2021.77 66 33 44.072 7950.00 -7.5
2021 10 17 0 0 .00 2021.79 66 33 44.146 7960.00 -5.2
2021 10 27 0 0 .00 2021.82 66 33 44.431 7970.00 3.6
2021 11 6 0 0 .00 2021.85 66 33 44.505 7980.00 5.9
2021 11 16 0 0 .00 2021.88 66 33 44.499 7990.00 5.7
2021 11 26 0 0 .00 2021.90 66 33 44.732 8000.00 12.9
2021 12 6 0 0 .00 2021.93 66 33 44.910 8010.00 18.4
2021 12 16 0 0 .00 2021.96 66 33 44.799 8020.00 15.0
The circumference of the Arctic Circle at the 2021 Northern Hemisphere summer solstice at UT 03:32 on 21 June at 66° 33’ 45.883” N, calculated in the WGS84 ellipsoid is predicted to be 15,984.722529869166 km or 9,932.446095967777 international miles or 8,631.059681354841 international nautical miles. Calculated in the WGS84 ellipsoid the area of the Arctic as defined by the Arctic Circle at the 2021 Northern Hemisphere summer solstice is predicted to be 21,207,485.872096 square km or 8,188,256.072475 square international miles.
Circumference calculated, using Charles Karney's Online rhumb line calculations using the RhumbSolve utility: "RhumbSolve is accurate to about 15 nanometers (for the WGS84 ellipsoid)" or 0.000015 of a millimetre/millimeter or 0.00000059 of an inch. In an email to me from Charles Karney: "The accuracy of 15 nanometers that I quote is for paths up to half-way round the earth." On RhumbSolve online: "RhumbSolve performs rhumb line calculations". "The path with a constant heading between two points on the ellipsoid at (lat1, lon1) and (lat2, lon2) is called the rhumb line (or loxodrome)". "NOTE: the rhumb line is not the shortest path between two points; that is the geodesic and it is calculated by GeodSolve. Area personally calculated in the WGS84 ellipsoid using Charles Karney's geodesic polygon calculations using the Planimeter utility. "The result for the area is accurate to about 0.1 m² per vertex."
Subpages:
Arctic Circle latitudes 2000-2004
Arctic Circle latitudes 2005-2009
Arctic Circle latitudes 2010-2014
Arctic Circle latitudes 2016-2019
Arctic Circle latitudes 2019-2024
Arctic Circle latitudes 2025-2029
Arctic Circle latitudes 2030-2034
Arctic Circle latitudes 2035-2039
Arctic Circle latitudes 2040-2044
Arctic Circle latitudes 2045-2049
This page the year 2021, every 10 days. See subpages at the bottom of this page for more years:
"The table (NAPA2050) was calculated by Prof. Markku Poutanen (Finnish Geodetic Institute) using software written by Dr. Matti Ollikainen (already retired from FGI)."
"The used nutation formulas are taken from The Astronomical Almanac 1984, PP S23-26. The Improved IAU system)".
A copy was sent to me from the National Land Survey of Finland:
Latitude and movement of the Arctic Circle
Since [year,month,day,h,m,s]: 2000 1 1 0 0 0
Until [year,month,day,h,m,s]: 2050 1 1 0 0 0
Date UT B.Y Latitude Days Movement
Y M D H Min Sec (metres, meters)
2021 1 10 0 0 .00 2021.03 66 33 46.963 7680.00 82.0
2021 1 20 0 0 .00 2021.05 66 33 46.585 7690.00 70.3
2021 1 30 0 0 .00 2021.08 66 33 46.393 7700.00 64.4
2021 2 9 0 0 .00 2021.11 66 33 46.235 7710.00 59.5
2021 2 19 0 0 .00 2021.14 66 33 45.886 7720.00 48.7
2021 3 1 0 0 .00 2021.16 66 33 45.551 7730.00 38.3
2021 3 11 0 0 .00 2021.19 66 33 45.488 7740.00 36.3
2021 3 21 0 0 .00 2021.22 66 33 45.500 7750.00 36.7
2021 3 31 0 0 .00 2021.25 66 33 45.340 7760.00 31.7
2021 4 10 0 0 .00 2021.27 66 33 45.310 7770.00 30.8
2021 4 20 0 0 .00 2021.30 66 33 45.574 7780.00 39.0
2021 4 30 0 0 .00 2021.33 66 33 45.706 7790.00 43.1
2021 5 10 0 0 .00 2021.36 66 33 45.667 7800.00 41.9
2021 5 20 0 0 .00 2021.38 66 33 45.808 7810.00 46.2
2021 5 30 0 0 .00 2021.41 66 33 46.004 7820.00 52.3
2021 6 9 0 0 .00 2021.44 66 33 46.002 7830.00 52.2
2021 6 19 0 0 .00 2021.47 66 33 45.832 7840.00 47.0
2021 6 29 0 0 .00 2021.49 66 33 45.800 7850.00 46.0
2021 7 9 0 0 .00 2021.52 66 33 45.809 7860.00 46.3
2021 7 19 0 0 .00 2021.55 66 33 45.504 7870.00 36.8
2021 7 29 0 0 .00 2021.57 66 33 45.169 7880.00 26.4
2021 8 8 0 0 .00 2021.60 66 33 45.068 7890.00 23.3
2021 8 18 0 0 .00 2021.63 66 33 44.887 7900.00 17.7
2021 8 28 0 0 .00 2021.66 66 33 44.512 7910.00 6.1
2021 9 7 0 0 .00 2021.68 66 33 44.284 7920.00 -1.0
2021 9 17 0 0 .00 2021.71 66 33 44.287 7930.00 -0.9
2021 9 27 0 0 .00 2021.74 66 33 44.238 7940.00 -2.4
2021 10 7 0 0 .00 2021.77 66 33 44.072 7950.00 -7.5
2021 10 17 0 0 .00 2021.79 66 33 44.146 7960.00 -5.2
2021 10 27 0 0 .00 2021.82 66 33 44.431 7970.00 3.6
2021 11 6 0 0 .00 2021.85 66 33 44.505 7980.00 5.9
2021 11 16 0 0 .00 2021.88 66 33 44.499 7990.00 5.7
2021 11 26 0 0 .00 2021.90 66 33 44.732 8000.00 12.9
2021 12 6 0 0 .00 2021.93 66 33 44.910 8010.00 18.4
2021 12 16 0 0 .00 2021.96 66 33 44.799 8020.00 15.0
The circumference of the Arctic Circle at the 2021 Northern Hemisphere summer solstice at UT 03:32 on 21 June at 66° 33’ 45.883” N, calculated in the WGS84 ellipsoid is predicted to be 15,984.722529869166 km or 9,932.446095967777 international miles or 8,631.059681354841 international nautical miles. Calculated in the WGS84 ellipsoid the area of the Arctic as defined by the Arctic Circle at the 2021 Northern Hemisphere summer solstice is predicted to be 21,207,485.872096 square km or 8,188,256.072475 square international miles.
Circumference calculated, using Charles Karney's Online rhumb line calculations using the RhumbSolve utility: "RhumbSolve is accurate to about 15 nanometers (for the WGS84 ellipsoid)" or 0.000015 of a millimetre/millimeter or 0.00000059 of an inch. In an email to me from Charles Karney: "The accuracy of 15 nanometers that I quote is for paths up to half-way round the earth." On RhumbSolve online: "RhumbSolve performs rhumb line calculations". "The path with a constant heading between two points on the ellipsoid at (lat1, lon1) and (lat2, lon2) is called the rhumb line (or loxodrome)". "NOTE: the rhumb line is not the shortest path between two points; that is the geodesic and it is calculated by GeodSolve. Area personally calculated in the WGS84 ellipsoid using Charles Karney's geodesic polygon calculations using the Planimeter utility. "The result for the area is accurate to about 0.1 m² per vertex."
Subpages:
Arctic Circle latitudes 2000-2004
Arctic Circle latitudes 2005-2009
Arctic Circle latitudes 2010-2014
Arctic Circle latitudes 2016-2019
Arctic Circle latitudes 2019-2024
Arctic Circle latitudes 2025-2029
Arctic Circle latitudes 2030-2034
Arctic Circle latitudes 2035-2039
Arctic Circle latitudes 2040-2044
Arctic Circle latitudes 2045-2049
