I agree with the blue sky being a result of rayleigh scattering. Despite rare inaccuracies; you have a great teaching method. The clarity of thought and transition of topic are spell binding. Great transmission of information as well.
thanks for the great lesson professor. ... just want to make a point ( maybe Ii´m not completely right on the total cause) with the reason on why the sky is blue. I studied that it really has to do with the "Rayleigh diffraction effect" of solar light in the wavelenght spectrum of the "blue". thanks again
Thank you for putting the time and thought into mapping out the information with diagrams and drawings. It has simplified complicated history book language and has given me a clearer picture of the Scientific Revolution.
I love this for its simplicity in presentation and how you explain specifically the point you are discussing. So many of these types of videos the presenters talk too fast or ramble about some non sequitur that just ends up confusing my students.
If I understand it correctly, da Vinci documented the circulation of blood before Harvey. Unfortunately, Leonardo did not publish his findings. He was (is) notorious for pursuing knowledge for its own sake, then moving on without sharing the results.
Thank you, this was helpful. I believe others would likely pointed this out but the sky is most certainly not blue due to the reflection of light off the oceans but instead because of The scattering of light as it passes through that interacts with molecules in the atmosphere absorbing other way planes and permitting the blue wave link to continue (sorry Siri is doing a horrible job)
You are a wonderful teacher. Not very student-centered teaching style but great for laying a firm introduction on which many many interesting kinds of activities can be built. Gracias
Hey you have to make a correction ......... The blue colour of sky is due to the scattering of light by small particles of the atmosphere (air molecules) when the light is incident on particles whose size is smaller than the wavelength of light, it is scattered ! i mean u will misinform the kids !!
I agree but I believe that the reason the sky appears to be blue is because smaller wavelengths are able to scatter more frequently than those of larger wavelengths the shortest wavelengths of visible light is purple but we do perceive the sky as a purple color since us humans are more perspective to the blue wavelengths or more sensitive to blue.
Can someone explain more in depth how Copernicus figured out the heliocentric model instead of just by saying he used scientific observation and reason?
In the Scientific Method, an observation/question comes before the hypothesis, it wouldn't make sense the make a hypothesis on something that you haven't questioned yet.
The sky isn't blue because it reflects the ocean, but that when light hits the Earth's atmosphere and Blue light is scattered more than the other colors because it travels as shorter, smaller waves. This is why we see a blue sky most of the time.
It helped a lot, thank you very much. And just saying, nowadays we know that the sky is blue by the light of the stars that comes here through some obstacles and that the color blue is the color that survives. If we look at the sky at night and with clouds (which is another obstacle for the light) we can see other colors.
Well that is not exactly correct either. The reason is scattering. The further the light beam travels in the atomsphere, the blue wavelengths scatter to the sides from small particles, while the red end of the wavelengths go straight. That is why sunsets are more red. The red end of the spectrum survives straight trough long distance of atomspwhere, while the blue wavelengths scatter to the sides. So when you look towards sun when it is low in the horizon, it is more red than in the midday. But if you look up to the sky, you see the scattered blue wavelengths.
You say that when people had questions about life, how things work, etc, the Church would default to the Bible or to ancient Rome or Greece. However please look at the following: Hildegard of Bingen (1098-1179) was a Benedictine nun and an accomplished botanist, pharmacist, author and composer, with access to a monastic library that was well stocked with scientific texts William of Ockham (1287-1347) was a Franciscan friar and physics professor. He is commonly known for Occam's razor, the methodological principle that bears his name, and also produced significant works on logic and physics. Roger Bacon (1219-1292) was a Franciscan friar and physics professor. He investigated optics and the refraction of light through lenses, leading to the development of spectacles. He sought reform of the calendar and was interested in astronomy. In 1266, at the request of Pope Clement IV, he collected many of his observations in his 'Opus Maius', an encyclopedia of all science. Robert Grosseteste (1175-1253) was the bishop of Lincoln and a physicist. Grosseteste is best known as an original thinker for his work concerning what would today be called science or the scientific method. Among his writings are: De sphera. An introductory text on astronomy, De luce. On the "metaphysics of light." (which is the most original work of cosmogony in the Latin West), De lineis, angulis et figuris. Mathematical reasoning in the natural sciences. Pope Sylvester II (946-1003) was an accomplished scientist who actively promoted the study of Greek, Roman, and Muslim scientific tracts. Nicholas Oresme (1320-1382) was an astronomer and physicist who provided a theoretical analysis of heliocentrism in the 14th century - and was the bishop of Lisieux. Jean Buridan (1300-1358) was a fourteenth century French priest and physicist who realized that an object in motion will stay in motion unless acted upon by an outside force Cathedrals were often used as solar observatories The Church ran a network of free schools and universities with science as part of the core curriculum Copernicus was an Augustinian canon who published his theories on heliocentrism at the request of a cardinal - and Pope Clement VII was an early supporter of his views I can go on forever. The Catholic Church and Christianity have contributed more to science than most are willing to admit. It was also the Catholic Church that created Universities so that people could get educated.
Great video! It was very informal, organized, and well thought out. I hate history, and I'm not good at it, but this was very informal and easy to understand. SUBSCRIBE button being pushed!!!!!
it is because Rayleigh scattering of sunlight in Earth's atmosphere causes diffuse sky radiation, which is the reason for the blue color of the daytime and twilight sky, as well as the yellowish to reddish hue of the low Sun.There is a whole spectar of colors or wavelengths of them the shortest wavelength is the color blue and by definition the shortest wavelength has the highest frequency.
Without capital how could there be Capitalism?? The money came from the exploitation of Bengal in India since it was occupied by the East India Company in 1757. The money came from the exploitation of Bengal in India since it was occupied by the East India Company in 1757. India also provided the market in the 19th century and as a result industry in India was wiped out due to the free trade with Britain.
Actually the sun is not stationary either. It is travelling just like planets, in the galaxy. You are a good teacher, but you could correct the facts in the video with captions. That would make the educational value of your video very good.
