Take a piece of card (A3, or so), attach two obelisks to the card by their bases and, with a light source, produce shadows - now, slowly bend the card so that it becomes convex (that is, the side with obelisks attached bulging out) and watch the effect. However, a demonstration can be achieved by a simple, local experiment (as opposed to having a party venture to a distant enough point): Shadows differ from place to placeĮratosthenes carried out this experiment to determine the circumference of the Earth, already assuming its spherical shape incidentally, the proof of such being consequential of the procedure. Luckily someone on the internet has already spent some time to help us here to make these easy to illustrate: 1. Simplest, you say? There are two that strike me as being simple to demonstrate.
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