Measuring the Earth's Radius with Legos

To measure the Earth's radius using Legos, you can employ a method similar to Eratosthenes' famous experiment. Build a vertical Lego structure and measure its shadow at local noon on the summer solstice. By comparing this shadow length with the shadow length at another location at the same time, you can estimate the Earth's radius using basic trigonometry and the distance between the two locations. Alternatively, you can use Legos to create a simple theodolite to measure the angle between the horizon and a celestial body, then use this angle and the distance to the point where the celestial body is directly overhead to calculate the Earth's radius.