Equant (or punctum aequans) is a mathematical concept developed by Claudius Ptolemy in the 2nd century AD to account for the observed motion of the planets. The equant is used to explain the observed speed change in different stages of the planetary orbit. This planetary concept allowed Ptolemy to keep the theory of uniform circular motion alive by stating that the path of heavenly bodies was uniform around one point and circular around another point. (Wikipedia).
The New Astronomy: Crash Course History of Science #13
This week on Crash Course: History of the Scientific Revolution—astronomical anomalies accrued. Meanwhile, in Denmark—an eccentric rich dude constructed not one but two science castles! And his humble German assistant synthesized a lot of new, old, and bold astronomical ideas into a single
From playlist History of Science
Mineralogy of Sedimentary Rocks: Weathering and Diagenesis
Now that we know some general information regarding sedimentary rocks, let's examine their mineralogy. What kinds of minerals can be found in sedimentary rocks? How do these minerals change over time? What can we say about weathering, and what does diagenesis mean? Let's find out! Script
From playlist Geology
Masaki Kashiwara's Chern Medal Laudatio — Pierre Schapira — ICM2018
Fifty years of mathematics with Masaki Kashiwara Pierre Schapira ICM 2018 - International Congress of Mathematicians © www.icm2018.org Os direitos sobre todo o material deste canal pertencem ao Instituto de Matemática Pura e Aplicada, sendo vedada a utilização total ou parcial do cont
From playlist Special / Prizes Lectures
N. Juillet - Deformation of singular spaces
Gigli and Mantegazza have observed how optimal transport and heat diffusion allow to describe the direction of the Ricci flow uniquely from the metric aspects of Riemannian manifolds. Their goal is to reformulate the Ricci flow so that it also makes sense for metric spaces. I will present
From playlist Journées Sous-Riemanniennes 2017
Alain Connes - Entropy and the spectral action
This is joint work with A. Chamseddine and W. van Suijlekom. We compute the information theoretic von Neumann entropy of the state associated to the fermionic second quantization of a spectral triple. We show that this entropy is given by the spectral action of the spectral triple for
From playlist Groupes, géométrie et analyse : conférence en l'honneur des 60 ans d'Alain Valette
From playlist Belong: What It's Like to Live in the Hyphen
P. Castillon - CAT(k)-spaces 2
The purpose of this course is to introduce the synthetic treatment of sectional curvature upper-bound on metric spaces. The basic idea of A.D. Alexandrov was to characterize the curvature bounds on the sectional curvature of a Riemannian manifold in term of properties of its distance funct
From playlist Ecole d'été 2021 - Curvature Constraints and Spaces of Metrics
Laurent Lafforgue - 3/4 Classifying toposes of geometric theories
Course at the school and conference “Toposes online” (24-30 June 2021): https://aroundtoposes.com/toposesonline/ Slides: https://aroundtoposes.com/wp-content/uploads/2021/07/LafforgueSlidesToposesOnline.pdf The purpose of these lectures will be to present the theory of classifying topose
From playlist Toposes online
Brad Scott in Finland 2015-05-31 PART 2/4
Brad Scott from Wild Branch Ministries is one of the best known Torah teachers in the Hebraic Roots community of Messianic bible-believers today. We had the privilege and honor to have him as a guest in Finland in May 2015, and we organized a few meetings for him to speak in about Hebraic
From playlist Brad Scott @ Finland/Suomi @ 2015/5
Cosmological Perturbation Theory / CMB (Lecture 6) by D. Pogosyan
Program Cosmology - The Next Decade ORGANIZERS : Rishi Khatri, Subha Majumdar and Aseem Paranjape DATE : 03 January 2019 to 25 January 2019 VENUE : Ramanujan Lecture Hall, ICTS Bangalore The great observational progress in cosmology has revealed some very intriguing puzzles, the most i
From playlist Cosmology - The Next Decade
From playlist Related Videos: Devour, Digest, YouTube Poop
