The document provides a timeline of important figures and events in astronomy from 3000 BC to 1727 AD. It summarizes the key contributions of figures like Aristarchus, who proposed the heliocentric model of the solar system; Ptolemy, who proposed the geocentric model; Tycho Brahe, who built important observatories; Galileo, who used telescopes to study astronomy; Kepler, who discovered the laws of planetary motion; and Isaac Newton, who discovered the law of universal gravitation and helped prove the heliocentric model. The timeline also notes the invention of the telescope in 1608, which greatly advanced the study of astronomy.

1. 3000 BC
TABLE OF CONTENTS
2500 BC STONEHENGE 2.... STONEHENGE
310 BC ARISTARCHUS IS BORN 3.... ARISTARCHUS
230 BC ARISTARCHUS DIES 4.... PTOLEMY
90 AD PTOLEMY IS BORN 5.... TYCHO BRAHE
168 AD PTOLEMY DIES 6.... GALILEO GALILEI
7.... JOHANNES KEPLER
1546 TYCHO BRAHE IS BORN 8.... TELESCOPE
1564 GALILEO GALILEI IS BORN 9.... ISAAC NEWTON
1571 JOHANNES KEPLER IS BORN
1601 TYCHO BRAHE DIES
1608 TELESCOPE IS INVENTED
1630 JOHANNES KEPLER DIES
1642 GALILEO GALILEI DIES, ISAAC NEWTON IS BORN
1727 ISAAC NEWTON DIES
ASTRONOMY TIMELINE
Michelle Marin

2. STONEHENGE
THE STONEHENGE, MANY HISTORIANS BELIEVE, WAS
BUILT IN 2500 BC.
HOW DID IT CONTRIBUTE TO ASTRONOMY?
PEOPLE WHO STUDIED THE STONEHENGE BELIEVE
THAT IT WAS AN ANCIENT OBSERVATORY. PEOPLE
ALSO BELIEVE THAT IT HAS AN ASTROLOGICAL AND A
SPIRITUAL MEANING BEHIND IT, TOO.
MANY PEOPLE BELIEVE THAT THE STONEHENGE WAS
BUILT TO PREDICT LUNAR AND SOLAR ECLIPSES.
BUILT
3000 BC 2500 BC

3. ARISTARCHUS
ARISTARCHUS WAS BORN IN 310 BC AND DIED IN 230 BC
ARISTARCHUS WAS THE FIRST KNOWN PERSON TO SAY
ABOUT THE HELIOCENTRIC MODEL OF THE SOLAR SYSTEM.
THE HELIOCENTRIC MODEL OF THE SOLAR SYSTEM STATES
THAT THE SUN IS THE CENTER OF THE SOLAR SYSTEM,
NOT THE EARTH.
ARISTARCHUS ALSO BELIEVED THAT STARS WERE FAR AWAY,
AND AT THAT TIME, THEY BELIEVED THAT THEY WERE
AROUND THE ORBIT OF SATURN.
BORN DIED
310 BC 230 BC

4. PTOLEMY
PTOLEMY BELIEVED THAT EARTH WAS
THE CENTER OF THE UNIVERSE. THIS IS EARTH
THE GEOCENTRIC MODEL OF THE SOLAR
SYSTEM. IT IS ALSO CALLED THE
PTOLEMAIC MODEL
PLANET
BORN DIED
90 AD 168 AD

5. TYCHO BRAHE
TYCHO BRAHE WAS GIVEN AN ISLAND IN 1574 TO SET
UP AN OBSERVATORY, WHICH BECAME ONE OF THE
BEST OBSERVATORIES IN ALL OF EUROPE. HE BUILT
NEW INSTRUMENTS. HE GOT ALL OF HIS MATERIALS
AND ITEMS HE OWNED AND LEFT IN 1597. AFTER HIS
DEATH IN 1601, HIS INSTRUMENTS WERE PRESERVED
AND LATER ON, WERE LOST.
BORN DIED
1546 1601

6. GALILEO GALILEI
1597- HE SUPPORTED THAT THE SUN WAS THE CENTER OF THE SOLAR
SYSTEM.
1609- HE USED THE TELESCOPE AND IMPROVED IT, FIRST WAS 9
POWER, THEN HE IMPROVED IT TO 30 POWER.
HE THOUGHT HE PROVED THAT THE EARTH WAS REVOLVING AROUND
THE SUN WITH TIDES, BUT HE WAS WRONG, IT WAS NOT THE REASON.
1632- HIS BOOK GOT PUBLISHED, THE CHURCH ORDERED FOR THE
PUBLICATION TO STOP.
1633 HE HAD TO STAND TRIAL FOR HERESY. HE WAS SENTENCED TO
LIFE IMPRISONMENT.
1638 HE PUBLISHED ANOTHER BOOK ABOUT MOTION, BUT AT THAT
TIME HE WAS ALREADY COMPLETELY BLIND.
BORN DIED
1564 1597 1609 1632 1633 1638 1642

7. JOHANNES KEPLER
JOHANNES KEPLER BELIEVED THAT ALL PLANET
ORBITS WERE ELLIPSE AND NOT PERFECTLY
CIRCULAR.
KEPLER ALSO BELIEVED THAT THE CLOSER A
PLANET WAS TO THE SUN, THE FASTER IT WILL
REVOLVE, AND THE FURTHER IT IS, THE SLOWER IT
WOULD REVOLVE.
LASTLY, HE BELIEVED THAT PLANETS FURTHER
AWAY WOULD HAVE A SLOWER ROTATION RATE.
BORN DIED
1571 1630

8. TELESCOPE
THE TELESCOPE WAS INVENTED BY HANS LIPPERHEY. HE WAS BORN IN
GERMANY AND HIS HOME WAS IN HOLLAND. THE TELESCOPE HIGHLY
AFFECTED ASTRONOMIC WORLD. THIS IS BECAUSE TELESCOPES, SUCH
AS THE HUBBLE SPACE TELESCOPE, LET US KNOW ABOUT OTHER
PLANETS THAT ARE OUT THERE IN OUR UNIVERSE. EVEN THOUGH THE
HUBBLE SPACE TELESCOPE IS A LOT MORE ADVANCED THAN THE
TELESCOPE LIPPERHEY INVENTED, LIPPERHEY’S TELESCOPE WAS STILL
A START. IT HELPS US SEE OTHER TRAITS OF OTHER PLANETS AND
BECAUSE OF THE TELESCOPE, WE CAN EXPAND OUR KNOWLEDGE
ABOUT OUTER SPACE. IT HELPS US SEE BEYOND OUR EYES.
INVENTED
1608

9. ISAAC NEWTON
ISAAC NEWTON CONTRIBUTED TO ASTRONOMY WITH THE
LAW OF GRAVITY. THIS IS BECAUSE THE LAW OF GRAVITY
HELPED PROVE THE HELIOCENTRIC SOLAR SYSTEM
WOULD ACTUALLY WORK, BECAUSE EVERYONE ALWAYS
WAS THINKING IF THE EARTH WAS MOVING, THEN WHY
ISN’T EVERYTHING IN THE EARTH FLYING AROUND? THE
LAW OF GRAVITY HELPED PROVE THAT EVEN IF THE
EARTH IS MOVING, NOT EVERYTHING HAS TO BE FLYING
AROUND. BECAUSE OF ISAAC NEWTON, WE KNOW THAT
ALL THE PLANETS IN FACT DO ORBIT THE SUN, NOT THE
EARTH.
BORN DIED
1642 1727