Carl Sagan on Epicycles, Ptolemy, and Kepler

[thegeffc]

great video thanks

[jayejayeee]

brilliant video

[thegeffc]

you have some great stuff here

[shoppittsburghnow]

some really good stuff here

[IloveYOUviruses]

black holes, inflation, dark matter, dark energy, dark force... that sounds to me like epicyles and epicyles and epicyles and epicyles and epicyles all due to their ignorance in electromagnetism

[T0B0KKE]

It was actually Tycho Brahe that acknowledged the real story behind the retrograde motion of the planets.

[LeFraz]

@T0B0KKE No, Tycho believed the planets orbited the sun, but that the sun orbited the Earth.

[T0B0KKE]

@LeFraz Tycho Brahe discovered why planets apparent movement among the starts went backwards at some point... I am certain of this. You can go check wikipedia.

[LeFraz]

@T0B0KKE It was actually Copernicus who proposed the heliocentric model which explained the retrograde motion of the planets.

[Npowell01]

@LeFraz

Ancient Hindus conceived of a heliocentric solar system long before Copernicus, and I imagine there was the occasional person through the ages who conceived of it without actually knowing how to write it down.

The thoughts of so many of history's geniuses are lost on us. Imagine the 180,000-or-so years of anatomically-modern humans who COULDN'T write. So much went unrecorded.

[skydome29]

@Npowell01 Aristarchus possibly modeled a heliocentric solar system in the BC's. Carl touches on your last part somewhere in the series/book, on the possible thoughts of the early humans.

[egomethods]

Carl Sagan is the Chuck Norris at being a prolocutor of science.

[CRISNCHIPS12398]

Good one Ptolemy...

[CRISNCHIPS12398]

Carl Sagan is a complete beast of intelligence.

[hailmetal16]

If carl sagan was my father, I would just follow him around when allowed, and take notes.

I'd be a much more rounded human being.

[Depic1]

it's like a blink, but too easy to miss it

[Depic1]

hahahaha phantom that was a good one

[DuctapePenguin]

Astrology is real, todays scientists are fools. Ancient and Medieval astrologers based their conclusions on experience and evidence, todays scientists are lost in equations with no experience or study of astrology..

Today's scientists have substituted mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality. - Nikola Tesla

[GMNives]

@DuctapePenguin Interesting quote mine. The real quote reads "Today’s scientists have substituted mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality." - Nice try, though. Also, Astrology is still bullshit. You should look into Cold Reading.

[Saktoth]

@GMNives

What, that quote is identical, did you get that wrong?

[AlienshateU]

Einstein's theory of relativity says that either is perfectly correct. Let an orrey run as usual or let it run while holding the earth still. But you must learn of the Michelson-Morley, Michelson-Gale, Airey, and Sagnac experiments. I will let the genius Malcolm Bowden explain:

watch?v=Xb3lGy0K9kg

[pontecanis]

@AlienshateU~ Malcolm Bowden is NOT a genius,he is an incompetent moron who created a BINARY system which no only does not fit planetary observations, but was disproved by Kepler almost 400 years ago. Trying to prove "biblical astronomy" is an asinine exercise in ignorance,stupidity,and arrogance.

[AlienshateU]

@pontecanis LoL. You are prime meat for deception. Do not fall for the staged 'alien' invasion coming soon to help bring in the 7 year New World Order just in time for 2012. This is the reason for the set ups by the people you have been conditioned to believe. Don't take the PositiveID vericips nor RFID Somark tattoos. I tell you all of this beforehand to expose the lies and so you will have no excuse to fall for any of them. 2 Thessalonians 2:9-12

[pontecanis]

@AlienshateU~ Thessalonians is pure BS to which I grant no credence--biblical prophesy is no more accurate than astrology, and less fun to boot. Religious delusions about 2012 have no interest for me other than as speculation about which medication would make them disappear...try Haloperidol.

[AlienshateU]

@pontecanis A a former atheist astrophysicist, iused to think the same thing. Then looked into it. The Bible has been 100% correct in regards to prophecy. Even the PositiveID verichips and RFID Somark tattoos are manifestations of the 2 millennia ole prophecy of Revelation 13:16-18. DO NOT TAKE THEM!

Zechariah 5 talks of modern day vimanas and vailixi like the TR-3B Astra. it is all true. Your hardened heart has made you spiritually blind. Open your eyes before it is too late!

[g9rocks64]

Ah, Carl Sagan, the consummate astronomer and teacher!

[anemosellinas]

OH MY GOD...HOW MISTAKEN THEY ARE I DONT UNDERSTAND WHY THEY ARE DOING THIS

The GREEKS and i am talking about thousands of years back ,,,not only knew and named the planets but they also knew the distance of one planet from the other.

[anthony68drake]

Love that "loop de loop".

[crocaduck]

This is great stuff! I'm going to watch all of Sagan's youtubes.

[anemosellinas]

iTS FOOLISH AND NOT TRUTH.

lONG BEFOR KOPERNIKOS.......the Greeks woul ask its others AGE with the word ILIKIA.

ILLIKIA=CIRCLE AROUND THE SUN.

So we would ask how many circles around the sun do you have when we wanted to ask a persons age.

For thousand, tens of thousands of years know we ask someones age in the same way.

IT was not kopernikos...he knew nothing about the Kosmos.

[anemosellinas]

Watch them but dont even believe one thied of what he is saying.

[TheClovis2]

Carl Sagan was a blind fool who was an anti-Christian liar who deceived millions of people and died and went to his appointed destination!

[anthony68drake]

Hmmm, I think rather that Sagan was a thinker, a sensitive and curious man. Though I believe in God, Judgment and Accountability, I do not relish at all the possibility of eternal damnation for this good man Carl Sagan. We do not know how men are judged, and though we have fools galore from the top on down in society today, this thoughtful scientist certainly was no fool.

[phantomspellchecker]

Carl Sagan had more intelligence in his toe nails than you do in your whole body.

[Timgracias]

@phantomspellchecker you mean an atom of his toenail

[kvm244]

@phantomspellchecker everyone has similar intelligence. What he did have was more insight.

[KOLSARNIT]

@phantomspellchecker agree

[TeslaSagan]

You are the daddy carl.

[JohnDeBunkTest]

Kepler understood the words of Galileo.

"I do not feel obliged to believe that the same God who has endowed us with sense, reason, and intellect has intended us to forgo their use."

The result was a young mind freed to learn from nature.

[graypj]

Condescending, temporal egotism & an exhibition of the reductionism of the mechanisitic view of the cosmos that led to her abuse in the 20th c.

[Hume77]

@graypj Gee, I guess we would be better off believing in astrology, miracles, witches, demons, gods and the other fuckwitted notions which we gave up. Yes, the life of ignorance, poverty, and religion is preferabe. Well, only if you're a Muslim or religious fundamentalism.

[vic0911]

YEP I AGREE

[gydorack]

Kepler was an amazing man, but there were plenty of pre-christian, and non-western people that have used science and natural laws before Kepler.

But Kepler was unique because he was born into a time in which he had no reason to believe in natural laws except for his own curiousity.

[Npowell01]

@gydorack

And the fact that he propelled himself into the darkness of assumption-free inquiry in an environment which showed no end of hostility to assumption-free inquiry is quite astonishing.

I can't say I'm sure I'd have the same bravery if I had been in his shoes. I can hope, but I can't assume it to be so. And that's the insight a healthy balance of skepticism/curiosity yields.