Ancient Astronomy Cont - Star catalogue(Hipparchus...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Ancient Astronomy Cont. Eratosthenes (276 - 195 BC) He measured the circumference of the Earth. The Sun is at the zenith in the city of Syene at noon on the summer solstice. But at the same time in Alexandria, it is 7 from the zenith. Eratosthenes inferred that Alexandria was 7 of latitude north of Syene. The distance between the two cities is 7/360 times the Earth’s circumference. His result of 42,000 km is very close to the right number: 40,000 km. Claudius Ptolemy (AD 100-170) Almagest (The Great Treatise)
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Star catalogue (Hipparchus), instruments A theory (model) of the motions of planets, Sun, Moon (Handy Tables) Based on Babylonian observations, preserved by Arabs, translated into Latin in 12th century Also wrote books on Geography and Astrology Geocentric Model Earth is at center Sun orbits Earth Planets orbit on small circles whose centers orbit the Earth on larger circles the small circles are called epicycles This explained retrograde motion...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern