Sundial for Brocton, England

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.

       Brocton Area

        Time       Xtime       Ytime        date         Xan         Yan        Teqn       XTeqn
       05h00      -2.390      -0.583       Jan01       0.040      -0.644      -15.00      -0.164
       05h30      -2.465      -0.330       Jan15       0.101      -0.588      -10.00      -0.109
       06h00      -2.498      -0.071       Feb01       0.149      -0.472       -5.00      -0.055
       06h30      -2.489       0.189       Feb15       0.154      -0.346        0.00       0.000
       07h00      -2.436       0.447       Mar01       0.135      -0.208        5.00       0.055
       07h30      -2.342       0.696       Mar15       0.099      -0.063       10.00       0.109
       08h00      -2.208       0.934       Apr01       0.044       0.114       15.00       0.164
       08h30      -2.036       1.155       Apr15       0.001       0.254                        
       09h00      -1.830       1.357       May01      -0.033       0.402                        
       09h30      -1.592       1.536       May15      -0.040       0.512                        
       10h00      -1.326       1.688       Jun01      -0.025       0.610                        
       10h30      -1.038       1.811       Jun15       0.004       0.650                        
       11h00      -0.733       1.904       Jul01       0.039       0.646                        
       11h30      -0.414       1.964       Jul15       0.065       0.599                        
       12h00      -0.089       1.990       Aug01       0.067       0.496                        
       12h30       0.238       1.982       Aug15       0.050       0.375                        
       13h00       0.561       1.940       Sep01       0.000       0.226                        
       13h30       0.874       1.866       Sep15      -0.051       0.087                        
       14h00       1.172       1.759       Oct01      -0.112      -0.078                        
       14h30       1.450       1.622       Oct15      -0.154      -0.220                        
       15h00       1.704       1.457       Nov01      -0.179      -0.383                        
       15h30       1.928       1.268       Nov15      -0.169      -0.500                        
       16h00       2.119       1.056       Dec01      -0.119      -0.602                        
       16h30       2.274       0.827       Dec15      -0.055      -0.649                        
       17h00       2.390       0.583                                                            
       17h30       2.465       0.330                                                            
       18h00       2.498       0.071                                                            
       18h30       2.489      -0.189                                                            
       19h00       2.436      -0.447