Sundial for Dendron

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.

       Dendron Area

        Time       Xtime       Ytime        date         Xan         Yan        Teqn       XTeqn
       05h00       2.407      -0.267       Jan01      -0.040       0.978      -15.00      -0.164
       05h30       2.475      -0.141       Jan15      -0.101       0.892      -10.00      -0.109
       06h00       2.500      -0.012       Feb01      -0.149       0.716       -5.00      -0.055
       06h30       2.482       0.118       Feb15      -0.154       0.526        0.00       0.000
       07h00       2.422       0.245       Mar01      -0.135       0.315        5.00       0.055
       07h30       2.321       0.368       Mar15      -0.099       0.096       10.00       0.109
       08h00       2.180       0.485       Apr01      -0.044      -0.173       15.00       0.164
       08h30       2.001       0.594       Apr15      -0.001      -0.385                        
       09h00       1.788       0.692       May01       0.033      -0.611                        
       09h30       1.545       0.778       May15       0.040      -0.777                        
       10h00       1.275       0.852       Jun01       0.025      -0.926                        
       10h30       0.984       0.910       Jun15      -0.004      -0.988                        
       11h00       0.675       0.953       Jul01      -0.039      -0.982                        
       11h30       0.355       0.980       Jul15      -0.065      -0.910                        
       12h00       0.029       0.990       Aug01      -0.067      -0.753                        
       12h30      -0.297       0.983       Aug15      -0.050      -0.570                        
       13h00      -0.619       0.959       Sep01       0.000      -0.343                        
       13h30      -0.930       0.919       Sep15       0.051      -0.132                        
       14h00      -1.225       0.863       Oct01       0.112       0.118                        
       14h30      -1.499       0.793       Oct15       0.154       0.333                        
       15h00      -1.747       0.708       Nov01       0.179       0.582                        
       15h30      -1.965       0.612       Nov15       0.169       0.760                        
       16h00      -2.150       0.505       Dec01       0.119       0.914                        
       16h30      -2.298       0.390       Dec15       0.055       0.985                        
       17h00      -2.407       0.267                  -0.040       0.978                        
       17h30      -2.475       0.141                                                            
       18h00      -2.500       0.012                                                            
       18h30      -2.482      -0.118                                                            
       19h00      -2.422      -0.245