Eratosthenes. Early life: ❏ Born in 276 BC ❏ Cyrene, Lybia ❏ Greek ❏ Went to the gymnasium(school) ❏ Nick name was Beta, or Pentathlos because he was.

Slides:

Advertisements

Similar presentations

History of Astronomy Notes

Advertisements

The Story of Eratosthenes The Circumference of the Earth

Earth and Moon Chapter 19 PS 1, PS7 (S.8.7.1, S.8.7.2, S.8.7.3)

ASTRONOMY 161 Introduction to Solar System Astronomy Class 5.

History of Astronomy The knowledge of the Ancients.

Mathematician, Geographer, Astronomer 276 BC- 194 BC

ASTR 2310: Chapter 2 Emergence of Modern Astronomy Early Greek Astronomy Ptolemaic Astronomy Copernican Astronomy Galileo: The First Modern Scientist Kepler's.

The Universe on a Large Scale

Ancient Astronomy Objects in the Sky move in cycles –Stars, Sun, Moon, eclipses, etc. Why did most ancient people care? –Agriculture –Religion Egyptians.

Advances in contemporary physics and astronomy --- our current understanding of the Universe Lecture 7: Physics of our star, the Sun May 21 th, 2003.

6 th Grade, HEKASI Mr. Ichigo Korosaki February 14, 2012.

Introduction Nicolaus Copernicus was born on the 19 of Febuary 1473, in the city of Torun. Nicolaus had three siblings He studied Astronomy and Mathematics.

Greek Astronomy. Ancient View of the Cosmos  Universe is 2-D  All celestial objects attached to a sphere.  Celestial Sphere is close  Climb a high.

Astronomy The Original Science. Astronomy Astronomy The stars and keeping time The stars and keeping time Calendar Calendar The study of all physical.

Motions of the Earth and Sky Part II. Depending on the relative sizes and distances of the Sun and a moon, you might see an eclipse like this: Sun planet.

The History of Astronomy Part Two Aristarchus, Parallax And the size of the Earth.

The Cycles of the Sun Astro Pages18-22 Earth and Space Science.

A survey of the solar system Michael Balogh The solar system (PHYS 275)

Ch 18.1 Astronomy-The Original Science Part 1 When you finish this section you will be able to 1. Identify the units of a calendar 2. Evaluate calendars.

Unit 4 Space Chapter 10…What we know about the universe has taken us thousands of years to learn.

Earth & Space Vocabulary. Astronomy  The study of the moon, stars, and other objects in space.

The Sky at Night What do we see?. The Sky at Night What do we see? The Moon Planets Perhaps a meteor shower, comet, or other rare event Stars - about.

Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Fix Astronomy Chapter 3.

Solar System Models Geocentric Model Earth Centered Moon, Sun, Planets, and Stars revolve around the Earth Feels right No observed parallax of stars.

History of Astronomy. Our Universe Earth is one of nine planets that orbit the sun The sun is one star in 100 billion stars that make up our galaxy- The.

© T Madas B.C.. © T Madas Eratosthenes was born in Cyrene which is now in Libya in North Africa and was a friend of Archimedes. His teachers included.

Astronomy 2 Overview of the Universe Winter Lectures on Greek Astronomy Joe Miller.

Exploring the Heavens. Humans have always looked up at the sky and wondered.

Astronomy 294z: Thursday, January 3 Professor Barbara Ryden The History of the Universe.

Whiteboardmaths.com © 2004 All rights reserved

Eratosthenes of Cyrene ( BC) Finding Earth’s Circumference January 21, 2013 Math 250.

An ancient method for finding the prime numbers.  Eratosthenes was a Greek mathematician from Cyrene (modern day Libya!). He was born in 276 BC, and.

History of Geometry.

Eratosthenes “Father of Geography”

Major Changes in Astronomy Within last 400 years: -- Earth is not the center -- Universe is immense Within last 200 years: -- Appreciate the age of the.

Phases of the Moon What Can You See

History of Astronomy From this To this

Earth Science 22.1 Origins of Astronomy Origins of Astronomy.

Factors, Multiples and Primes. Prime Numbers A Prime Number is a number that can only be divided by two numbers: – The number 1 – The number itself 3.

A Quick Tour of the Universe (and this course) Part 2.

MEASURING THE SOLAR SYSTEM Eratosthenes, Aristarchus The century after Euclid.

Page 1 FAMOUS ASTRONOMERS. Page 2 ARISTOTLE Proved the Earth is round Worked with Optics Created a "prototype" of the Scientific Method His influence.

Astronomy- The Original Science Pages A. Astronomy- the study of all physical objects beyond Earth.

Chapter 3b The Science of Astronomy. 3.2 Ancient Greek Science Why does modern science trace its roots to the Greeks? How did the Greeks explain planetary.

1 Giants of Science Our understanding of the Universe developed slowly over centuries. Most of the breakthroughs came through careful study of the positions.

Quaestio: Why did the Church try to silence scientific discoveries? Nunc Agenda: Analyze the map of the solar system and try to correctly identify each.

Measurements, Triangulation & Conclusion Part I. Performing Experiments Experiments must be repeatable – requires careful control over variables Possible.

Ancient Greek Astronomy

The Spread of Greek Culture Notes 8-4. Alexandria During Hellenistic Era, cultural center –Philosophers –Scientists –Poets –Writers More than 500,000.

More about Celestial Motion “The reality which scientific thought is seeking must be expressionable in mathematical terms, mathematics being the most precise.

Bell Ringer – At one time it was not unusual for an ocean voyage to last 3 or more years and space was very limited. If you had to leave home.

How Eratosthenes measured the radius of the Earth

Introduction to Astronomy Ancient cultures, early astronomers and how we got to what we know today.

Earth in Space. How Earth Moves Earth moves through space in two major ways: rotation and revolution.

The “Geocentric Model” Aristotle vs. Aristarchus (3 rd century B.C.): Aristotle: Sun, Moon, Planets and Stars rotate around fixed Earth. Ancient Greek.

THE OLD GUYS. Astronomers Click on astronomers to guide you through the PowerPoint. All red boxes are links. Use them to guide you!

CHAPTER 1.1 – EARTH IN SPACE. I. HOW EARTH MOVES Definition of Astronomy: The study of the moon, stars, and other objects in space. Definition of Astronomy:

s.html Year 8 Mathematics Multiples, Factors and Primes.

No matter what kind of map is made, some portion of the Earth’s surface will always look either too small, too big, or out of place. Mapmakers have, however,

ANCIENT ASTRONOMY Chapter 1 ANCIENT ASTRONOMY In the British Isles, stones were used to keep track of the Sun and Moon. In the British Isles, stones.

History of Astronomy Why did ancient cultures study astronomy? Several cultures kept very exact records of astronomical events (and could even predict.

Motions of Earth, the Moon and Planets

CONSTELLATIONS. WHAT are they? When we look into the night sky, it appears that everything is attached to the “dome” of the sky.

History of Astronomy Ch Early Civilizations Greeks, Romans, Egyptians, and Chinese – All had some general interpretations of the Universe – Played.

Study of objects outside of Earth & its atmosphere.

The History Of Astronomy

PowerPoint Presentation

History of Astronomy.

Earth and Moon.

National History Day Project

Presentation transcript:

Eratosthenes

Early life: ❏ Born in 276 BC ❏ Cyrene, Lybia ❏ Greek ❏ Went to the gymnasium(school) ❏ Nick name was Beta, or Pentathlos because he was always in second place in terms of his education, but was a well rounded student.

Education ❏ At age 6, he went to the gymnasium (a school) ❏ Studied in Athens ❏ Was convinced to move to Alexandria where he became the librarian ❏ Teachers ❏ Lysanias of Cyrene-scholar ❏ Ariston of Chios-philosopher ❏ Studied under Zeno ❏ Callimachus-Poet, Scholar

Adult life: ❏ Worked math ❏ Found the circumference of the Earth (or tried) his units were the size of a stadium he lived by so no one knows how accurate his measurement really was ❏ Made the sieve number which is now important for number theory ❏ Worked on music ❏ Wrote books on comedy, history, constellations, geography and philosophy

Major accomplishments in astronomy: ❏ Invention of the armillary sphere ❏ Size of the earth ❏ Distance to the moon and distance to the sun ❏ Got a accurate answer to the tilt of the earths axis ❏ unknown as to how he got his answer ❏ Star map with 675 stars ❏ Suggested that there be an extra day added to the calendar every 4th year.

Armillary sphere ❏ Also called the spherical astrolabe ❏ Used to study stars, celestial bodies, and position of the sun ❏ Helped people navigate the ocean ❏ Used in Asia, Islamic empire and by greeks ❏ Set of rings around a sphere ❏ some rings mean the circles of heaven ❏ The position was calibrated by finding an object in the sky and positioning it that way.

Size of the Earth: jQ The way in which he did this was he noticed that the sun would hit a certain certain object once a year on the same day. Then measured the distance from Alexandria to Syene. Since the sun was extremely far away he assumed that the suns rays were for the most part parallel. Then he came up with the angles created from these measurements and his answer is extremely close to the real deal. Using this measurement he created a map of the world based off of them.

Distance to the moon/sun ❏ made these based off of lunar cycles for both sun and moon ❏ Were no where near as accurate as the distance calculated for the earth ❏ His guess for the sun was km, and the real distance is 149,600,000 km

What was known at the time: ❏ A year is about 365 days long- Egyptians ❏ The Earth is a sphere-Pythagoras ❏ The Earth rotates on an axis- Heraclides ❏ Space is infinite-Plato ❏ We move around the sun- Philolous ❏ use of the sundial

What wasn’t known or incorrect ❏ Don’t know that we are in a galaxy ❏ Sun is the center of the solar system- Aristarchus ❏ Many planets orbit the earth-Heraclides

Things named after him: ❏ Eratosthenes crater, found on the moon ❏ A lunar period ( MYA) ❏ And a seamount close to Cyprus.

Bibliography Images: French School, “Eratosthenes,” n.d. nndb.com, September 7, Luiza, untitled September 7, “Athens,” September 7, September 5, “Armilitary Sphere” September 7, NASA, “Earth and Moon Image” September 7, NASA, “Crater” September 7, Capuzzi, Mike. “Leap Year” September 6, Content: O’Connor, J.J. & Robertson, E.F. “Eratosthenes of Cyrene” www-history.mcs.st-and.ac.uk. September 5, September 5, Arizona State University, “Eratosthenes Crater” September 5, Geologic Data Scale. www. sites.google.com/site/geologicdatascale. September 6, 2014 Gold, Ethan, “Meet Eratosthenes Seamount” September 4, Green, Nick, “Eratosthenes of Cyrene” September 5, “Armilitary Sphere” September 7, Poulsen, Erling, “Astrolnomical Timeline” September 7,