of the Clothier Bell Tower is 148 feet.

History: Eratosthenes and the Earth

In ancient Greece, mathematician Eratosthenes made a name for himself in the history books by calculating the circumference of the Earth by using shadows. Many other mathematicians had attempted the problem before, but Eratosthenes was the first one to actually have any success. His rate of error was less than 2%.

Eratosthenes used shadows to calculate the distance around the Earth. As an astronomer, he determined the time of the summer solstice when the sun would be directly over the town of Syene in Egypt (now Aswan). On this day, with the sun directly above, there were no shadows, but in Alexandria, which is about 500 miles north of Syene, Eratosthenes saw shadows. He calculated based on theThe Tide Knot (The Ingo Chronicles #2)

The world of Ingo is once again brought to life in Helen Dunmore's newest spellbinding sequel "The Tide Knot." "There's a current racing ahead, the colour of the darkest blue velvet. We plunge forward. The current is so strong that it crushes me. I'm jolting, juddering, struggling in its grip, but I can't break away. It's got me, like a cat with a bird in its claws." Sapphy, Conor and their mum have moved away from the cottage by the cove - away from the memories of their father, who disappeared two years ago - to the nearby town of St Pirans. Ever since, Sapphy has felt withdrawn and restless; she can't adjust to her new home and new life, and can't