"derived" elset epoch dates

From: John Gardner (gardjw@juno.com)
Date: Sat Jan 29 2000 - 11:27:17 PST

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    Hello All,
    
    Can anyone here on SeeSat-L advise any significance/purpose of the
    "derived" epoch dates ( epoch dates where the decimal day portion
    equals zero--thus midnight ) released by USSPACECOM since early 1999?
    
    As an example until recently most of the NOAA birds had such an
    epoch date.  Granted no effect on the accuracy of elsets, but I
    was wondering what is the impetus for the startup/continued usage of
    such a date for an object. I've found some 70 objects thus reported.
    
    
    
    John Gardner,Jr
    Hoarder of TLEs
    gardjw@juno.com
    
    76.98569 W  39.00195 N   62.484m  ASL
    
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