A special project for a special period in the lives of people on planet Earth. COVID-19 has changed the approach to solving all problems, as well as the process of teaching and learning around the world. Uncertainty in the consistency of offline teaching contributes to a complete focus on the online environment and project work. Students from all continents cooperate and collaborate to reproduce one of the science's 10 most beautiful experiments of all time: Eratosthenes' measurement of the Earth's circumference. Eratosthenes experiment is always the preferable example for our students and for the implementation of the Inquiry method. Inquiry learning and active learner involvement can lead to important outcomes in the classroom. Students will also share knowledge about solar clocks and organize quizzes and competitions in the design and construction of solar clocks. We will inspire students and teachers to make mini-projects for the construction of solar clocks .