Download Geogebra Classique 5: https://www.geogebra.org/download
Draw easily the figure, just by copy/paste of 2 lines data from the Eratos Google spreadsheet
Download and open one of the 3 model files: Download Zip File
Table NN (for 2 shadows towards the north) |
![](/files/collabspace/3/43/543/10543/images/bc10d6636.jpg) |
Table NS (for one shadow towards the north and one shadow towards the south) |
![](/files/collabspace/3/43/543/10543/images/be12bedb6.jpg) |
Table SS (for 2 shadows towards the south) |
![](/files/collabspace/3/43/543/10543/images/bd11cabf6.jpg) |
. Link to the shared google spreadsheet to register your measurement: