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119,708 Views • Oct 11, 2017 • Click to toggle off description
How the ancient Greeks understood the universe; what they got right and what they got wrong. How Aristotle understood the Earth was round by observing lunar eclipses; how Aristarchus of Samos used these results to work out the relative sizes of Earth, the Sun, and Moon, how Eratosthenes of Cyrene measured Earth's circumference, and how Hipparchus of Nicaea determined created the first catalog of stars and discovered Earth's 26,000 year axial precession, Finally, we take a look at Claudius Ptolemy's collection of works in the Almagest, and how he came up with a system of epicycles to explain planets' retrograde motion.
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Views : 119,708
Genre: Science & Technology
Date of upload: Oct 11, 2017 ^^


Rating : 4.814 (89/1,823 LTDR)
RYD date created : 2022-02-21T06:30:38.802569Z
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YouTube Comments - 112 Comments

Top Comments of this video!! :3

@cheekiblin690

1 year ago

Early astronomy sounds more challenging than it does now due to a lot of reliance on assumptions, even Eratosthenes had to assume the distance between Alexandria and Seyene. Ptolemy's idea of epicycles and the difference around Earth to explain retrograde motion was very interesting, and definitely a thinker in his free time!

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@ggzyt_livitup3898

4 years ago

Yay! Progress!!!!

44 |

@Rustyzip53

5 years ago

I'm going through your older videos and find them interesting and valuable. A while back I took Coursera class on astro-archaeology. This professor claimed the shafts in the Great Pyramid of Khufu could not be ventilation shafts because vertical ones would sufficed and have been easier to make. He also claimed that the south facing shafts pointed to the stars in Orion's belt and Sirius. His conclusion was that the shafts were to "direct symbolically the Pharaoh to his proper destinations in the sky."

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@Astronomynatureandmusic

4 years ago

What a wonderful video. Your calm voice, the relaxed pace, accompanied by clear, carefully selected and to-the-point visuals. A real story teller if you ask me.

37 |

@faramund9865

9 months ago

Dude this video is great. Wish there was more of this.

3 |

@nonridiculousadjective6597

5 years ago

Great video ! I used information in this video as schema for part of my "year work" and of course I included your video in links.

4 |

@retrogrademotionpictures4985

5 years ago

Excellent video. Great explanations of the concepts involved.

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@therestinghornet6906

3 years ago

This was such a fun video, I hope you still make videos like these, I learned a lot

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@ghostfifth

4 years ago

I fell in love with you at around 1:40 with that flat earth joke

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@feynstein1004

4 years ago

Lovely explanations. I think Hipparchus' and Aristarchus' calculations of the distance and size of the sun and moon would've been even more awesome. It shows that we didn't just come up with the knowledge we have today and just how effective math, in this case trigonometry, is.

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@remali26

4 years ago

Great video!!! Well done sir, well done!

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@rugglovr

1 year ago

Beautiful work

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@Chase_baker_1996

3 years ago

I absolutely love this stuff

3 |

@ayyappanramasamy3080

4 years ago

Thank you. Nice Information

2 |

@sm6756

3 years ago

Great great summary video

2 |

@Chamorristaxd

5 years ago

awesome video, thanks

1 |

@vikaskatiyar9185

3 years ago

I have liked the video now & watch it later because undobtly ancient technology was great.

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@elizabethmacharia9786

4 years ago

I am working on interpreting this to spanish, for personal use, and its kicking my ass. Thanks for the video.

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@glenngaseby4077

5 years ago

jeez this helped me so much. thanks

1 |

@randomdude7812

4 years ago

Aristotle's haircut is dope. Hhaha Thanks for video. Your video was shown in our class this morning. Just doing a review

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