Re: Number of days 100 million years ago

[john-schneiderman@cox.net]

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