Re: Number of days 100 million years ago

["Thomas R. Holtz, Jr." <tholtz@umd.edu>]

However, please note that you should not extrapolate a linear change over
longer periods of time: it is a more complex dynamic problem than that.

On Mon, July 1, 2013 7:12 pm, john-schneiderman@cox.net wrote:
> 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
>


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