Sundial for Richards Bay

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.

	Richards Bay
        Time       Xtime       Ytime        date         Xan         Yan        Teqn       XTeqn
       05h00       2.427      -0.289       Jan01      -0.040       0.933      -15.00      -0.164
       05h30       2.484      -0.134       Jan15      -0.101       0.852      -10.00      -0.109
       06h00       2.500       0.023       Feb01      -0.149       0.684       -5.00      -0.055
       06h30       2.472       0.179       Feb15      -0.154       0.502        0.00       0.000
       07h00       2.402       0.333       Mar01      -0.135       0.301        5.00       0.055
       07h30       2.291       0.481       Mar15      -0.099       0.092       10.00       0.109
       08h00       2.141       0.621       Apr01      -0.044      -0.165       15.00       0.164
       08h30       1.954       0.750       Apr15      -0.001      -0.368                        
       09h00       1.734       0.866       May01       0.033      -0.583                        
       09h30       1.484       0.968       May15       0.040      -0.742                        
       10h00       1.209       1.053       Jun01       0.025      -0.884                        
       10h30       0.913       1.119       Jun15      -0.004      -0.943                        
       11h00       0.601       1.167       Jul01      -0.039      -0.937                        
       11h30       0.279       1.195       Jul15      -0.065      -0.869                        
       12h00      -0.047       1.202       Aug01      -0.067      -0.719                        
       12h30      -0.373       1.189       Aug15      -0.050      -0.544                        
       13h00      -0.693       1.155       Sep01       0.000      -0.328                        
       13h30      -1.000       1.102       Sep15       0.051      -0.126                        
       14h00      -1.291       1.030       Oct01       0.112       0.113                        
       14h30      -1.559       0.940       Oct15       0.154       0.318                        
       15h00      -1.801       0.834       Nov01       0.179       0.556                        
       15h30      -2.012       0.714       Nov15       0.169       0.725                        
       16h00      -2.188       0.581       Dec01       0.119       0.873                        
       16h30      -2.327       0.439       Dec15       0.055       0.941                        
       17h00      -2.427       0.289                  -0.040       0.933                        
       17h30      -2.484       0.134                                                            
       18h00      -2.500      -0.023                                                            
       18h30      -2.472      -0.179                                                            
       19h00      -2.402      -0.333