# Sundial for Pietermaritzburg

Note that the "squares" on the diagram must look square, ie one unit of length horizontally must equal one unit of length vertically.

The data used to create this sundial are listed below, if you want to make your own large "walk-on" sundial. The columns are:

• Time: time at each marker on the timeline.
• Xtime: X (horizontal) offset from 0.0 (centre of graph) of each time marker.
• Ytime: Y (vertical) offset from 0.0 (centre of graph) of each time marker.
• Date: Date of each marker on the date line and analemma ("8")
• Xan: X (horizontal) offset from 0.0 (centre of graph) of each date marker on the analemma.
• Yan: Y (vertical) offset from 0.0 (centre of graph) of each date marker on the analemma; this is equal to the Y offset for the dateline. The X values for the dateline are 0.0.
• Teqn: The offsets of time correction scale at the foot of the analemma, in minutes. -15 means the Sun is 15 minutes late (e.g. in February), so 15 minutes must be added to the time read from the shadow crossing the timeline when standing on the dateline. +15 means the Sun is 15 minutes early (e.g. in early November), so 15 minutes must be subtracted from the time read from the shadow crossing the timeline when standing on the dateline.
• XTeqn: X (horizontal) offset from 0.0 of the time correction at the foot of the analemma. The Y value is set to place it conveniently below the analemma.
The units for the X and Y distances are metres for a walk-on sundial.
Note that the time- and datelines should be drawn as smooth curves.

```       Pietermaritzburg
Time       Xtime       Ytime        date         Xan         Yan        Teqn       XTeqn
05h00       2.419      -0.313       Jan01      -0.040       0.925      -15.00      -0.164
05h30       2.480      -0.154       Jan15      -0.101       0.844      -10.00      -0.109
06h00       2.500       0.007       Feb01      -0.149       0.678       -5.00      -0.055
06h30       2.477       0.169       Feb15      -0.154       0.498        0.00       0.000
07h00       2.411       0.327       Mar01      -0.135       0.298        5.00       0.055
07h30       2.304       0.480       Mar15      -0.099       0.091       10.00       0.109
08h00       2.158       0.625       Apr01      -0.044      -0.163       15.00       0.164
08h30       1.975       0.759       Apr15      -0.001      -0.365
09h00       1.758       0.880       May01       0.033      -0.578
09h30       1.510       0.986       May15       0.040      -0.736
10h00       1.238       1.075       Jun01       0.025      -0.876
10h30       0.943       1.146       Jun15      -0.004      -0.935
11h00       0.633       1.197       Jul01      -0.039      -0.929
11h30       0.312       1.227       Jul15      -0.065      -0.861
12h00      -0.014       1.237       Aug01      -0.067      -0.713
12h30      -0.341       1.226       Aug15      -0.050      -0.539
13h00      -0.661       1.193       Sep01       0.000      -0.325
13h30      -0.970       1.140       Sep15       0.051      -0.125
14h00      -1.262       1.068       Oct01       0.112       0.112
14h30      -1.533       0.977       Oct15       0.154       0.316
15h00      -1.778       0.870       Nov01       0.179       0.551
15h30      -1.992       0.747       Nov15       0.169       0.719
16h00      -2.172       0.612       Dec01       0.119       0.865
16h30      -2.315       0.467       Dec15       0.055       0.932
17h00      -2.419       0.313                  -0.040       0.925
17h30      -2.480       0.154
18h00      -2.500      -0.007
18h30      -2.477      -0.169
19h00      -2.411      -0.327

```

since 2002/04/30
www.hartrao.ac.za/other/sundial/sdlpmb.html
Last updated 2002/04/30 by M Gaylard