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@aefthymiou
Story of the day PRIME MERIDIAN Since the late 19th century, the Prime Meridian at Greenwich has served as the reference line for GMT. The world's Prime Meridian divides the eastern and western hemispheres of the Earth - just as the equator divides the northern and southern hemispheres. 🧵 1/2
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@aefthymiou
🧵 2/2 In 1884 the Prime Meridian was defined by the Transit Circle telescope at the Royal Observatory, which was built by Sir George Biddell Airy, the 7th Astronomer Royal, in 1850. The cross-hairs in the eyepiece of the telescope precisely defines Longitudes 0 for the world.
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