Sundial for Lydenburg

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.

       Lydenburg Area

        Time       Xtime       Ytime        date         Xan         Yan        Teqn       XTeqn
       05h00       2.420      -0.266       Jan01      -0.040       0.964      -15.00      -0.164
       05h30       2.481      -0.130       Jan15      -0.101       0.880      -10.00      -0.109
       06h00       2.500       0.008       Feb01      -0.149       0.707       -5.00      -0.055
       06h30       2.476       0.147       Feb15      -0.154       0.519        0.00       0.000
       07h00       2.410       0.283       Mar01      -0.135       0.311        5.00       0.055
       07h30       2.302       0.414       Mar15      -0.099       0.095       10.00       0.109
       08h00       2.155       0.537       Apr01      -0.044      -0.170       15.00       0.164
       08h30       1.971       0.652       Apr15      -0.001      -0.380                        
       09h00       1.754       0.756       May01       0.033      -0.602                        
       09h30       1.506       0.846       May15       0.040      -0.767                        
       10h00       1.233       0.923       Jun01       0.025      -0.913                        
       10h30       0.939       0.983       Jun15      -0.004      -0.974                        
       11h00       0.628       1.026       Jul01      -0.039      -0.968                        
       11h30       0.307       1.052       Jul15      -0.065      -0.897                        
       12h00      -0.020       1.060       Aug01      -0.067      -0.743                        
       12h30      -0.346       1.050       Aug15      -0.050      -0.562                        
       13h00      -0.666       1.022       Sep01       0.000      -0.338                        
       13h30      -0.975       0.977       Sep15       0.051      -0.130                        
       14h00      -1.267       0.914       Oct01       0.112       0.117                        
       14h30      -1.537       0.836       Oct15       0.154       0.329                        
       15h00      -1.782       0.744       Nov01       0.179       0.574                        
       15h30      -1.995       0.639       Nov15       0.169       0.749                        
       16h00      -2.175       0.523       Dec01       0.119       0.902                        
       16h30      -2.317       0.398       Dec15       0.055       0.972                        
       17h00      -2.420       0.266                  -0.040       0.964                        
       17h30      -2.481       0.130                                                            
       18h00      -2.500      -0.008                                                            
       18h30      -2.476      -0.147                                                            
       19h00      -2.410      -0.283