| Flag | City | Country | School | Latitude (°) +N/-S | Longitude (°) +N/-S |
 | Chivilcoy | Argentina | Parque Cielos del Sur | -34.911 | -60.014 |
| Date | Gnomon height [cm] | Shadow length [cm] | Angle (°) |
| 02/01/2021 | 48.0 | -10.3 | -12.1 |
| 07/01/2021 | 34.9 | -7.8 | -12.6 |
| 08/01/2021 | 29.0 | -6.6 | -12.8 |
| 09/01/2021 | 28.8 | -6.6 | -12.9 |
| 12/01/2021 | 203.0 | -48.0 | -13.3 |
| 13/01/2021 | 250.0 | -60.0 | -13.5 |
| 19/01/2021 | 21.0 | -5.5 | -14.7 |
| 22/01/2021 | 32.0 | -8.8 | -15.4 |
| 23/01/2021 | 44.5 | -12.5 | -15.7 |
| 27/01/2021 | 37.9 | -11.3 | -16.6 |
| 29/01/2021 | 36.8 | -11.4 | -17.2 |
