Zero Shadow day Celebration

It is said that Your shadow is your only faithful follower was proven wrong by the students of Shri Natesan Vidyasala Matric. Hr. Sec. School as they observed Zero shadow day on the 18th of August at about 12: 13 PM which happened to be the local noon that day. It is an astronomical event where in one's shadow falls directly below the foot and hence appear to vanish. We will have No shadow only two times every year, once between December solstice (21st/22nd December) and June solstice (20th/21st June) and then between June solstice and December solstice and this will happen in the region which lies between the latitudes 23.5° south (the tropic of Capricorn) and 23.5° north (the tropic of Cancer). People in Chennai which is at 13.0827° N above the equator are lucky to witness this twice per year. The students came out of their classes to measure and observe their shadows vanish for a moment. They also observed the 6 meter tall flag pole virtually had no shadow at that time. The Greek mathematician, geographer and astronomer, Eratosthenes (276-194 BC) was the first to make use of this observation (Zero Shadow Day), to estimate the diameter of Earth.