Sundial for Harare, Zimbabwe

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.

       Harare, Zimbabwe
        Time       Xtime       Ytime        date         Xan         Yan        Teqn       XTeqn
       05h00       2.426      -0.184       Jan01      -0.040       1.014      -15.00      -0.164
       05h30       2.484      -0.086       Jan15      -0.101       0.926      -10.00      -0.109
       06h00       2.500       0.013       Feb01      -0.149       0.743       -5.00      -0.055
       06h30       2.473       0.112       Feb15      -0.154       0.546        0.00       0.000
       07h00       2.403       0.209       Mar01      -0.135       0.327        5.00       0.055
       07h30       2.293       0.303       Mar15      -0.099       0.100       10.00       0.109
       08h00       2.143       0.391       Apr01      -0.044      -0.179       15.00       0.164
       08h30       1.957       0.472       Apr15      -0.001      -0.400                        
       09h00       1.737       0.546       May01       0.033      -0.634                        
       09h30       1.487       0.610       May15       0.040      -0.807                        
       10h00       1.212       0.664       Jun01       0.025      -0.961                        
       10h30       0.916       0.706       Jun15      -0.004      -1.025                        
       11h00       0.605       0.736       Jul01      -0.039      -1.019                        
       11h30       0.283       0.754       Jul15      -0.065      -0.944                        
       12h00      -0.044       0.759       Aug01      -0.067      -0.782                        
       12h30      -0.370       0.750       Aug15      -0.050      -0.591                        
       13h00      -0.689       0.729       Sep01       0.000      -0.356                        
       13h30      -0.997       0.696       Sep15       0.051      -0.137                        
       14h00      -1.288       0.650       Oct01       0.112       0.123                        
       14h30      -1.556       0.594       Oct15       0.154       0.346                        
       15h00      -1.798       0.527       Nov01       0.179       0.604                        
       15h30      -2.010       0.451       Nov15       0.169       0.788                        
       16h00      -2.187       0.368       Dec01       0.119       0.949                        
       16h30      -2.326       0.278       Dec15       0.055       1.022                        
       17h00      -2.426       0.184                  -0.040       1.014                        
       17h30      -2.484       0.086                                                            
       18h00      -2.500      -0.013                                                            
       18h30      -2.473      -0.112                                                            
       19h00      -2.403      -0.209