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POPSClipXploration - Calendars 1 There is not just one Aztec calendar, there are two more or less independent systems. One calendar, called the xiuhpohualli, has 365 days. It describes the days and rituals related to the seasons, and therefor might be called the agricultural year or the solar year. The other calendar has 260 days. In Nahuatl, the language of the Aztecs, it is called the tonalpohualli or, the day-count. Most information on this Internet-site refers to the tonalpohualli, which is the sacred calendar.
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POPSClipXploration - From Stargazers to Starships 5 Of special interest to teachers: back to top 'Stargazers' in the Classroom "Stargazers" and National Science Education Standards Inventory of concepts, calculations and stories, by section. A list of problems related to the material. Additional Problems "Using Space to Teach Physics" (draft of article in The Physics Teacher, Feb.'99) "Kepler's 3 Laws of Planetary Motion," a one-hour overview lecture to teachers presented 23 March 2005. Afterthoughts on what this site has become. Author and Curator: Dr. David P. Stern Greenbelt, Maryland Mail to Dr.Stern: stargaze("at" symbol)phy6.org .
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POPSClipXploration - From Stargazers to Starships 3 Peripheral Subjects related to section S-7 above: LS-7A The Discovery of Atoms and Nuclei (A very quick overview of the relevant history.) S-7A The Black Hole at the Center of our Galaxy S-8. Nuclear Power S-9. Nuclear Weapons
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POPSClipXploration - From Stargazers to Starships 1 "Kepler's 3 Laws of Planetary Motion," a one-hour overview lecture to teachers presented 23 March 2005. Guide to the sections on Kepler's Laws which follow below. 10. Kepler and his Laws 10a. The Scale of the Solar System 11. Graphs and Ellipses 11a. Ellipses and Kepler's First Law 12. Kepler's Second Law 12a. More on Kepler's Second Law 12b. How Orbital Motion is Calculated Optional: The 2004 Transit of Venus 12c. Halley's Method of Deriving the AU 12d. The displacement D of the track of Venus 12e. Deriving the Astronomical Unit
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POPSThe Universe - A ClipXploration * 8 These are some of my NASA bookmarks from 5 years ago. If the link doesn't work anymore go to the main site and search for the info. It is probably still there but has been updated. Two more clips in this ClipXploration series
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POPSThe Universe - A ClipXploration * 7
Another citation from Google Scholar on Wave function of the Universe . The quantum state of a spatially closed universe can be described by a wave function which is a functional on the geometries of compact three-manifolds and on the values of the matter fields on these manifolds. The wave function obeys the Wheeler-DeWitt second-order functional differential equation. We put forward a proposal for the wave function of the "ground state" or state of minimum excitation: the ground-state amplitude for a three-geometry is given by a path integral over all compact positive-definite four-geometries which have the three-geometry as a boundary. The requirement that the Hamiltonian be Hermitian then defines the boundary conditions for the Wheeler-DeWitt equation and the spectrum of possible excited states. To illustrate the above, we calculate the ground and excited states in a simple minisuperspace model in which the scale factor is the only gravitational degree of freedom, a conform
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POPSThe Universe - A ClipXploration * 5 This is a result of a search for 'universe' on Google Scholar. The large-scale structure of the universe is the article abstract I chose. I clipped some keywords associated with this article by NASA.
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POPSThe Universe - A ClipXploration * 4 I added this clip because it shows how little google knows of the universe- To be accurate google would have to present every picture ever made ever because they are all part of the universe. Since searches are based upon words and not concepts this is accurate for their purposes.
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POPSThe Universe - A ClipXploration * 3 Here is information on the show Stephen Hawking's Universe. There is a nice message from Stephen= "Where do we come from? How did the universe begin? Why is the universe the way it is? How will it end? "All my life, I have been fascinated by the big questions that face us, and have tried to find scientific answers to them. If, like me, you have looked at the stars, and tried to make sense of what you see, you too have started to wonder what makes the universe exist. The questions are clear, and deceptively simple. But the answers have always seemed well beyond our reach. Until now. "The ideas which had grown over two thousand years of observation have had to be radically revised. In less than a hundred years, we have found a new way to think of ourselves. From sitting at the center of the universe, we now find ourselves orbiting an average-sized sun, which is just one of millions of stars in our own Milky Way galaxy. And our galaxy itself is just one of billions of gala
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POPSThe Universe - A ClipXploration : History Channel Special This is a remarkably good series for the layman but they omit a lot of content and are extremely narrow in their focus. If you have not watched any episodes yet I highly recommend it for the shear entertainment and graphics. If you find these concepts interesting, do yourself a favor and search a bit deeper into the concepts they present. While they don't lie, they are very vague on some interesting concepts.
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