Significant events and persons leading to the proposal of the idea that Earth is spherica by johnrich galvez https://padlet.com/johnrichgalvez/o79pktck21o1bfa6 Physical Science en-us 2022-04-21 05:25:20 UTC 2022-04-25 05:49:56 UTC hello@padlet.com Pythagoras (500 B.C.E) johnrichgalvez https://padlet.com/johnrichgalvez/o79pktck21o1bfa6/wish/2151506990 Pythagoras' idea of spherical Earth was validated by Aristotle a couple of centuries later, around 340 B.C. One of Aristotle's strong arguments for a spherical Earth during his time was the traveller's tales of ships disappearing over the horizon and the Pole star shifting to a higher position in the sky as one journeyed north suggested a curved Earth.]]> 2022-04-21 05:39:01 UTC https://padlet.com/johnrichgalvez/o79pktck21o1bfa6/wish/2151506990 Mars johnrichgalvez https://padlet.com/johnrichgalvez/o79pktck21o1bfa6/wish/2151513048 2022-04-21 05:45:05 UTC https://padlet.com/johnrichgalvez/o79pktck21o1bfa6/wish/2151513048 Ancient Greeks johnrichgalvez https://padlet.com/johnrichgalvez/o79pktck21o1bfa6/wish/2151521427 The earliest documented mention of the concept dates from around the 5th century BC, when it appears in the writings of Greek philosophers. In the 3rd century BC, Hellenistic astronomy established the roughly spherical shape of Earth as a physical fact and calculated the Earth's circumference.]]> 2022-04-21 05:54:05 UTC https://padlet.com/johnrichgalvez/o79pktck21o1bfa6/wish/2151521427 Moon johnrichgalvez https://padlet.com/johnrichgalvez/o79pktck21o1bfa6/wish/2151521938 2022-04-21 05:54:34 UTC https://padlet.com/johnrichgalvez/o79pktck21o1bfa6/wish/2151521938 Aristotle (340 B.C) johnrichgalvez https://padlet.com/johnrichgalvez/o79pktck21o1bfa6/wish/2151524438 The Greek philosopher Aristotle (384-322 B.C.) is credited as the first person to try and calculate the size of the Earth by determining its circumference (the length around the equator) He estimated this distance to be 400,000 stades (a stadia is a Greek measurement equaling about 600 feet).]]> 2022-04-21 05:56:03 UTC https://padlet.com/johnrichgalvez/o79pktck21o1bfa6/wish/2151524438 Satelite johnrichgalvez https://padlet.com/johnrichgalvez/o79pktck21o1bfa6/wish/2155920881 2022-04-25 05:01:20 UTC https://padlet.com/johnrichgalvez/o79pktck21o1bfa6/wish/2155920881 Anaxogaras (500 to 430 B.C) johnrichgalvez https://padlet.com/johnrichgalvez/o79pktck21o1bfa6/wish/2155923976 Anaxogaras
-one of the student of Pythagoras
-supported Pythagoras proposal.
- he observed that during a lunar eclipse, the Earth's shadow was reflected on the moon's surface. The shadow reflected was circular]]> 2022-04-25 05:04:50 UTC https://padlet.com/johnrichgalvez/o79pktck21o1bfa6/wish/2155923976 Space Rockets johnrichgalvez https://padlet.com/johnrichgalvez/o79pktck21o1bfa6/wish/2155924365 2022-04-25 05:05:17 UTC https://padlet.com/johnrichgalvez/o79pktck21o1bfa6/wish/2155924365 Eratosthenes (240 B.C) johnrichgalvez https://padlet.com/johnrichgalvez/o79pktck21o1bfa6/wish/2155927306 Erastothenes 
-great mathematician who calculated the earth circumference.
- he determine the shape of the earth by putting a vertical stick on the ground. 
- he concluded that the Earth's surface is curved]]> 2022-04-25 05:08:44 UTC https://padlet.com/johnrichgalvez/o79pktck21o1bfa6/wish/2155927306