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Hellenistic culture - Coggle Diagram
Hellenistic culture
Astronomy
Alexandria’s museum contained a small observatory in which astronomers could study the planets and stars.
Aristarchus estimated that the Sun was at least 300 times larger than Earth, and although greatly underestimating its size, disproved the belief that the Sun was smaller than Greece.
Aristarchus proposed that the Earth and other planets revolved around the Sun, but his idea was rejected. 
Ptolemy incorrectly placed Earth at the centre of the solar system, which was accepted as truth for millenia.
Eratosthenes calculated Earth's circumference to 28-29 thousand miles which was reasonably accurate.
Physics
Archimedes used geometry and physics to invent the Archimedes screw, a device that raised water from the ground, and the compound pulley to lift heavy objects.
Archimedes developed the law of the lever which can use less force to move heavy objects.
Using Archimedes’ ideas, Hellenistic scientists later built a force pump, pneumatic machines, and even a steam engine.
Philosophy
Stoicism
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Preached the importance of living life in harmony with the natural laws of God and the dangers of human desire.
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Sculptures
Statues expressed realism, honouring gods, commemorating heroes, and portraying ordinary people in everyday situations.
The Colossus of Rhodes was the largest Hellenistic statue standing over 100 feet tall, and was one of the seven wonders of the ancient world.
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Mathematics
Mathematician Euclid published a book named "Elements" which contained 465 geometry propositions and proofs. It forms the bases of modern geometry.
Archimedes correctly estimated the value of pi.
Hellenism and Alexandria
Hellenistic culture is Greek culture blended with Egyptian, Persian and Indian influences. It was created as a result of Alexander the Great's expansive conquests.
Alexandria's great beauty was admired by many residents and visitors. It's famous lighthouse the Pharos and its museum and library attracted scholars from around the world. Trade ships from around the Mediterranean docked at Alexandria's spacious harbor. It's thriving commerce helped it prosper as a centre of the Hellenistic era and become an international community.