There are materials that may be of interest to complement the main subject of "Eratosthenes project".
They have been prepared by members of the EAAE:
Solving problems with a solar motion demonstrator
Luminosity and temperature of the Sun
Determining latitude and longitude observing only one star
Let us observe the daily path of the Sun
The Sun and its daily and annual paths
Making helioscopes with four sticks
Measuring the diameter of the Sun
Sunrise ans sunset positions change every day
The Sun above and below the local horizon
Observations with a pinhole camera
Latitude gnomon and quadrant for the whole year
Studies on the shadow of an obelisk used as horizontal sundial