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Re: Number of days 100 million years ago



Thank you for the correction on distance to moon. Found that the moon is receeding at a rate of 3.8 cm/year, so after 100,000,000 years the moon was ~ 3,800 km closer than it is now [less than 1% different]


On Mon, Jul 1, 2013 at 12:11 PM, Thomas R. Holtz, Jr. wrote:

The Earth-Moon distance for the 400 Ma mark seems WAAAAAYYY too close!!

Even the ~900 Ma values found by Kvale et al. (1999) found a semimajor
axis of just under 365000 km.

http://jsedres.geoscienceworld.org/content/69/6/1154.abstract

On Mon, July 1, 2013 12:09 pm, john-schneiderman@cox.net wrote:
Are these data points correct?


Years ago     Days/Year     Hours/Day     Distance Moon from Earth

Current          365.25            24               384000 km

  65,000,000    ~369           ~23.75         ~360000 km
100,000,000   ~371           ~23.60         ~336000 km

400,000,000   ~400           ~22              ~192000 km





Thomas R. Holtz, Jr.
Email: tholtz@umd.edu   Phone: 301-405-4084
Office: Centreville 1216
Senior Lecturer, Vertebrate Paleontology
Dept. of Geology, University of Maryland
http://www.geol.umd.edu/~tholtz/
Fax: 301-314-9661

Faculty Director, Science & Global Change Program, College Park Scholars
http://www.geol.umd.edu/sgc
Fax: 301-314-9843

Mailing Address:        Thomas R. Holtz, Jr.
                        Department of Geology
                        Building 237, Room 1117
                        University of Maryland
                        College Park, MD 20742 USA