Sundial for Nelspruit

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.

	Nelspruit
        Time       Xtime       Ytime        date         Xan         Yan        Teqn       XTeqn
       05h00       2.183      -0.235       Jan01      -0.036       0.865      -15.00      -0.164
       05h30       2.235      -0.110       Jan15      -0.091       0.790      -10.00      -0.109
       06h00       2.250       0.016       Feb01      -0.134       0.634       -5.00      -0.055
       06h30       2.225       0.142       Feb15      -0.139       0.465        0.00       0.000
       07h00       2.163       0.266       Mar01      -0.122       0.279        5.00       0.055
       07h30       2.064       0.385       Mar15      -0.089       0.085       10.00       0.109
       08h00       1.929       0.498       Apr01      -0.039      -0.153       15.00       0.164
       08h30       1.762       0.602       Apr15      -0.001      -0.341                        
       09h00       1.564       0.696       May01       0.029      -0.541                        
       09h30       1.339       0.777       May15       0.036      -0.688                        
       10h00       1.092       0.846       Jun01       0.023      -0.819                        
       10h30       0.826       0.900       Jun15      -0.004      -0.874                        
       11h00       0.546       0.939       Jul01      -0.035      -0.869                        
       11h30       0.256       0.961       Jul15      -0.058      -0.805                        
       12h00      -0.038       0.967       Aug01      -0.060      -0.667                        
       12h30      -0.331       0.957       Aug15      -0.045      -0.504                        
       13h00      -0.619       0.930       Sep01       0.000      -0.304                        
       13h30      -0.896       0.887       Sep15       0.046      -0.117                        
       14h00      -1.158       0.830       Oct01       0.101       0.105                        
       14h30      -1.400       0.758       Oct15       0.139       0.295                        
       15h00      -1.618       0.672       Nov01       0.161       0.515                        
       15h30      -1.808       0.576       Nov15       0.152       0.672                        
       16h00      -1.967       0.470       Dec01       0.107       0.809                        
       16h30      -2.093       0.355       Dec15       0.050       0.872                        
       17h00      -2.183       0.235                  -0.036       0.865                        
       17h30      -2.235       0.110                                                            
       18h00      -2.250      -0.016                                                            
       18h30      -2.225      -0.142                                                            
       19h00      -2.163      -0.266