David Custis Kimball - blog
You: Why Dave; why now?
Me: Well, I've two talented kids; the younger mentioned my stopping with the lectures. Then enthusiastically asked, 'Dad, can I help you set up a blog?' Moments later, Me: 'OK, that's a great idea, thinkin' they might just read it someday.
me ---> 'Gaarr of Blog' <---
Goto oft comments on Art, Bose-Einstein Condensate (BEC), CommoNonsense, Dance, Dark Matter, Design, Etc., Environment, Eventspace, Fable, Food, Frogsense, Hazard Mitigation, Hegel, History, Horsense, Human Affairs, Humor, Law+Lawless, Mathematics, Medicine, Music, Nerd Stuff, Parenting, Physics, Psychophysics, Real Estate, Sailing, Science, Science Fiction, Swimming, Technology, Theology, UncommonSense, and Waldo, alphabetically.
Just use 'Search' for the topic of choice or Waldo, perhaps.
Matters of Import & Timely Expertise
repressing gossip and hate-speech.
An Unmapped Ponderocity:
To say: '"He is a man of truth," is to say nothing; to say: "He is a man of of," is to state an elementary truth of logic.'
Winston Davids, 1969 - Trinity College Valedictorian - 1970; known endeavor: actuarial contributions to The Donald; since has contacted me and sadly is quite ill. Ask prayers for recovery; thanks for his brilliance and music.
Environment, Physics, Science, History
What are the environmental impacts of the 2.4 degree change in 41,000 years? The 26,000 year cycle includes or doesn’t the ‘wobble’ associated with precession? Needs some work understanding this. Lots of cycles to integrate, eg. the 600,000 yr. Yellowstone Super Volcano, the 20,000 year Sahara Desert to Tropical lake and swamp (there’s a fresh water lake a mile under the sand).
Axial precession is the movement of the rotational axis of an astronomical body, whereby the axis slowly traces out a cone. In the case of Earth, this type of precession is also known as the precession of the equinoxes or precession of the equator. Earth goes through one such complete precessional cycle in a period of approximately 26,000 years. Over this cycle, Earth’s north axial pole moves from where it is now, within 1° of Polaris, in a circle around the ecliptic pole, with an angular radius of about 23.5 degrees. Thus, while today the star Polaris lies approximately at the north celestial pole, this will change over time, and other stars will become the “north star”. The south celestial pole currently lacks a bright star to mark its position, but over time precession will also cause bright stars to become south stars. As the celestial poles shift, there is a corresponding gradual shift in the apparent orientation of the whole star field, as viewed from a particular position on Earth.
The angle between Earth’s rotational axis and the normal to the plane of its orbit (obliquity) oscillates between 22.1 and 24.5 degrees on a 41,000-year cycle. It is currently 23.44 degrees and decreasing.
(via greatmindsofscience)
