How do light and shadows help us understand time and natural phenomena like eclipses?

Early humans used the length and position of shadows cast by the Sun to measure time during the day. Light enables us to see objects, and shadows show the shape and position of these objects. The Earth and Moon cast shadows that cause eclipses, which are important astronomical events. Studying light and shadows helps explain day and night cycles caused by Earth's rotation. This understanding connects everyday experiences with larger cosmic events.