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The Big Bang

In 1929 Edwin Hubble discovered the universe 

is rapidly expanding. The cause of this was 

found to be a point in time 14 billion years ago 

when a violent reaction caused the creation of 

the universe.

Stonehenge (3,100 bc)

A huge formation of stones constructed in 

Britain approximately 5,000 years ago. It is 

believed to a be some sort of ancient 

observatory.

Aristotle (384-322 BC)

Regarded as one of the greatest 

philosophers of all time, Aristotle also 

studied a great amount of astronomy. He 

was one of the first to theorize not only a 

spherical Earth, but a spherical universe.

Aristarchus (310-230 bc)

Aristarchus was a Greek philosopher who 

believed the then unthinkable theory of 

heliocentricity. Which during that time 

conflicted with the main theme of a 

geocentric universe   proposed by religious 

principles.

Eratosthenes (284-192 bc)

A Greek Mathematician by nature, he was 

also an excellent astronomer. He was able 

to successfully deduce the circumference of 

the Earth by measuring the angle of 

shadows compared to the surface.

Hipparchus (190-120 BC)

This Greek astronomer is often known for 

his study of equinoxes, or the alterations of 

star positions resulting from intersection by 

the Earth’s orbit.

Ptolemy (90-168 AD)

A Greek citizen of Egypt known for his work 

in astronomy. He created geocentric 

models he claimed were inspired by his 

predecessors. His astronomical models 

were presented in table which could be 

used to determine the locations of celestial 

bodies, past or present. 

Nicholas Copernicus (1473-1543)

A Polish astronomer who had theorized that 

the sun was not the center of the universe, 

but was slightly offset. This idea was 

developed using a device created by 

Ptolemy called the equant point.

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