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.

       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