Analemmatic Sundial computed by Richard Koolish

Lat: 42.413, Lon: -71.175, Semi-Major: 3.0, Semi-Minor: 02.023, Focus: 02.215

Zone: -75.0, Correction: -03.825 deg = -15.300 min

Hour points as x and y, azimuth and radius 
or focus distances.

Dials not on the time zone meridian are adjusted 
for longitude and are not symmetrical.

Hour: 4,   x: -02.692, y: -00.893,   az: 251.659, z: 02.836,   f1: 04.988, f2: 01.012
Hour: 5,   x: -02.943, y: -00.392,   az: 262.410, z: 02.969,   f1: 05.173, f2: 00.827
Hour: 6,   x: -02.993, y: 00.135,   az: -87.418, z: 02.996,   f1: 05.210, f2: 00.790
Hour: 7,   x: -02.840, y: 00.653,   az: -77.051, z: 02.914,   f1: 05.096, f2: 00.904
Hour: 8,   x: -02.492, y: 01.126,   az: -65.680, z: 02.735,   f1: 04.840, f2: 01.160
Hour: 9,   x: -01.975, y: 01.523,   az: -52.363, z: 02.494,   f1: 04.458, f2: 01.542
Hour: 10,   x: -01.323, y: 01.816,   az: -36.083, z: 02.247,   f1: 03.977, f2: 02.023
Hour: 11,   x: -00.581, y: 01.985,   az: -16.325, z: 02.068,   f1: 03.429, f2: 02.571
Hour: 12,   x: 00.200, y: 02.019,   az: 05.661, z: 02.029,   f1: 02.852, f2: 03.148
Hour: 13,   x: 00.968, y: 01.915,   az: 26.815, z: 02.146,   f1: 02.285, f2: 03.715
Hour: 14,   x: 01.670, y: 01.681,   az: 44.813, z: 02.369,   f1: 01.767, f2: 04.233
Hour: 15,   x: 02.258, y: 01.332,   az: 59.462, z: 02.622,   f1: 01.333, f2: 04.667
Hour: 16,   x: 02.692, y: 00.893,   az: 71.659, z: 02.836,   f1: 01.012, f2: 04.988
Hour: 17,   x: 02.943, y: 00.392,   az: 82.410, z: 02.969,   f1: 00.827, f2: 05.173
Hour: 18,   x: 02.993, y: -00.135,   az: 92.582, z: 02.996,   f1: 00.790, f2: 05.210
Hour: 19,   x: 02.840, y: -00.653,   az: 102.949, z: 02.914,   f1: 00.904, f2: 05.096
Hour: 20,   x: 02.492, y: -01.126,   az: 114.320, z: 02.735,   f1: 01.160, f2: 04.840

Date offsets along the Y axis.

Dec: -23.440,  Y Offset: -00.960
Dec: -18.000,  Y Offset: -00.720
Dec: -12.000,  Y Offset: -00.471
Dec: -06.000,  Y Offset: -00.233
Dec: 00.000,  Y Offset: 00.000
Dec: 06.000,  Y Offset: 00.233
Dec: 12.000,  Y Offset: 00.471
Dec: 18.000,  Y Offset: 00.720
Dec: 23.440,  Y Offset: 00.960


Jan 1,  Dec: -23.010,  Y Offset: -00.941
Feb 1,  Dec: -17.330,  Y Offset: -00.691
Mar 1,  Dec: -07.820,  Y Offset: -00.304
Apr 1,  Dec: 04.300,  Y Offset: 00.167
May 1,  Dec: 14.900,  Y Offset: 00.589
Jun 1,  Dec: 21.970,  Y Offset: 00.894
Jul 1,  Dec: 23.150,  Y Offset: 00.947
Aug 1,  Dec: 18.160,  Y Offset: 00.727
Sep 1,  Dec: 08.500,  Y Offset: 00.331
Oct 1,  Dec: -02.950,  Y Offset: -00.114
Nov 1,  Dec: -14.230,  Y Offset: -00.562
Dec 1,  Dec: -21.710,  Y Offset: -00.882


Jun 21,  Dec: 23.440,  Y Offset: 00.960
Dec 21,  Dec: -23.440,  Y Offset: -00.960