# Sundial for Polokwane / Pietersburg

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.

```	Polokwane / Pietersburg

Time       Xtime       Ytime        date         Xan         Yan        Teqn       XTeqn
05h00       2.167      -0.245       Jan01      -0.036       0.876      -15.00      -0.164
05h30       2.228      -0.128       Jan15      -0.091       0.800      -10.00      -0.109
06h00       2.250      -0.009       Feb01      -0.134       0.642       -5.00      -0.055
06h30       2.234       0.110       Feb15      -0.139       0.471        0.00       0.000
07h00       2.179       0.227       Mar01      -0.122       0.282        5.00       0.055
07h30       2.087       0.340       Mar15      -0.089       0.086       10.00       0.109
08h00       1.960       0.447       Apr01      -0.039      -0.155       15.00       0.164
08h30       1.799       0.547       Apr15      -0.001      -0.345
09h00       1.607       0.637       May01       0.029      -0.547
09h30       1.388       0.717       May15       0.036      -0.697
10h00       1.145       0.784       Jun01       0.023      -0.830
10h30       0.882       0.838       Jun15      -0.004      -0.885
11h00       0.604       0.877       Jul01      -0.035      -0.880
11h30       0.316       0.901       Jul15      -0.058      -0.816
12h00       0.023       0.910       Aug01      -0.060      -0.675
12h30      -0.271       0.904       Aug15      -0.045      -0.511
13h00      -0.560       0.882       Sep01       0.000      -0.308
13h30      -0.840       0.845       Sep15       0.046      -0.118
14h00      -1.105       0.793       Oct01       0.101       0.106
14h30      -1.351       0.728       Oct15       0.139       0.299
15h00      -1.575       0.650       Nov01       0.161       0.522
15h30      -1.771       0.562       Nov15       0.152       0.681
16h00      -1.937       0.463       Dec01       0.107       0.819
16h30      -2.070       0.357       Dec15       0.050       0.883
17h00      -2.167       0.245                  -0.036       0.876
17h30      -2.228       0.128
18h00      -2.250       0.009
18h30      -2.234      -0.110
19h00      -2.179      -0.227

```

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