2007            
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  The epoch T=J2007.5 is the date 2007 July  2.875  (JD 2454284.375)
  it corresponds to the Besselian epoch B2007.50144

                                         h  m
 Beginning of the spring March     21,  0 07.4 UT
    >>            summer June      21, 18 06.4 UT
    >>            autumn September 23,  9 51.2 UT
    >>            winter December  22,  6 07.8 UT
                                         h
 The Earth at perihelion January    3, 19.7 UT
 The Earth at aphelion   July       6, 23.9 UT