tag:blogger.com,1999:blog-8959556.post1059416373247674877..comments2024-02-21T17:30:40.448-05:00Comments on An Objectivist Individualist: Greenhouse Gases Warmed the Earth Somewhat, but Additions Now Cool the EarthCharles R. Anderson, Ph.D.http://www.blogger.com/profile/09610765984333672076noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-8959556.post-49260162684739222052015-08-05T22:41:14.947-05:002015-08-05T22:41:14.947-05:00Thank you Tom.
I could not see how the precession...Thank you Tom.<br /><br />I could not see how the precession angle could affect that calculation myself, but I have not accessed those earlier Chilingar papers that discussed that calculation yet. I had thought that the only thing I could think of that might affect that calculation was the tilt of the Earth with respect to the orbit about the sun compounded with the fact that the Earth is flattened at the poles and the equatorial circumference was greater than that through the two poles. But describing that should take two parameters at least, not the single angle of the Chilingar calculation. At one point in the present Chilingar paper he mentions two precession angles, one of 23.44 degrees and one of 3.18 degrees, but there is no mention of how the 3.18 degree precession angle affects the climate calculation. It appears that Chilingar has made another mistake in language, similar to his mistaken use of specific heat. <br /><br />So, the Earth has a tilt (obliquity) of its axis of rotation with respect to the plane of its orbit around the sun. That tilt is presently 23.44 degrees, but that angle varies with a precession over several tens of thousands years. Chilingar should have called this the angle of tilt of the Earth's daily rotational axis with the axis of its annual rotation around the sun.<br /><br />Thanks again for raising this question Tom and for suggesting the answer. I will update the text.<br /><br />Charles R. Anderson, Ph.D.https://www.blogger.com/profile/09610765984333672076noreply@blogger.comtag:blogger.com,1999:blog-8959556.post-25890842861595220002015-08-05T16:58:01.457-05:002015-08-05T16:58:01.457-05:00Hi Charles,
I have a very minor point of confusio...Hi Charles,<br /><br />I have a very minor point of confusion. Your review of the Chilingar paper states that "Earth has a precession angle of [psi] 23.44 [degrees]." Isn't that the obliquity angle -- or have I got eccentricity, precession, obliquity wrong?<br /><br />I seem to remember that Earth's "obliquity" was 23.5 degrees from perpendicular to the orbital plane, but I could be wrong. <br /><br />Tom Anderson<br />Anonymousnoreply@blogger.com