IV. Penumbral lunar eclipse of 2013 May 25


     The beginning of the eclipse is visible from the extreme southwest of Euro-
 pe, western half of Africa, Antarctica, southeast half of Northern, Central and
 Southern America, Atlantic and eastern Pacific oceans.
     The end of the eclipse  is  visible  from  the west of Africa,  Antarctica, 
 Northern (except for extreme northwest), Central  and  South America, Atlantic 
 and east of the Pacific oceans.



                   Universal time of geocentric opposition
                                                   h  m  s
                in right ascension  2013, May 4,  3 55 07.3


                                                  Sun              Moon
                                                h  m  s          h  m  s
  Right ascension  . . . . . . . . . . . . .   4 08 30.368     16 08 30.367
                                                      s                s   
     Hourly motion . . . . . . . . . . . . .       +10.104         +159.394
                                                o  '  "          o  '  "   
  Declination. . . . . . . . . . . . . . . . +20 57 58.41     -19 23 49.99 
                                                      "                "   
     Hourly motion . . . . . . . . . . . . .       +26.79          -224.40 
                                                      "          o  '  "   
  Equatorial horizontal parallax . . . . . .         8.68       1 01 03.29 
                                                   '  "             '  "   
  Apparent semidiameter  . . . . . . . . . .     15 47.47         16 38.22 



                        Circumstances of the Eclipse
                                                             Position Angles
                                                           of the Moon's axis
                                                          h  m        o
       Moon enters penumbra . . . . . . .      May 25,   3 43.9     12.21
       Greatest eclipse . . . . . . . . .                4 10.1     12.10
       Moon leaves penumbra . . . . . . .                4 36.3     12.00

 --------------------------------------------
  Contacts¦  Position ¦The Moon being in the Zenith in
 of penum.¦   Angles  +----------------------
 with Limb¦  from the ¦          ¦             Magnitude of the eclipse          0.038
  of Moon ¦North Point¦ Latitude ¦ Longitude                                      "
 ---------|-----------|----------|-----------  Angular radius of the penumbra 4711.53
          ¦    o  '   ¦    o  '  ¦    o  '                                        "  
 First    ¦ 176 03.7  ¦ -19 30.4 ¦  56 52.0 W  Angular radius of the umbra    2779.38
 Last     ¦ 194 36.1  ¦ -19 33.6 ¦  69 26.0 W

-------------------------------------------------------------------------------
     ¦     ¦      ¦      ¦Magnitudes of¦     ¦     ¦      ¦      ¦Magnitudes of
  T  ¦  s  ¦   d  ¦   P  ¦  penumbral  ¦  T  ¦  s  ¦   d  ¦   P  ¦  penumbral  
     ¦     ¦      ¦      ¦  eclipse    ¦     ¦     ¦      ¦      ¦  eclipse    
-----|-----|------|------|-------------|-----|-----|------|------|-------------
  h m¦    "¦      ¦    ° ¦             ¦  h m¦    "¦      ¦    ° ¦             
 3 40¦ 5723¦ 2.059¦ 174.7¦      -      ¦ 4 10¦ 5624¦ 2.023¦ 173.2¦    0.043
   50¦ 5668¦ 2.040¦ 178.2¦    0.016    ¦   20¦ 5635¦ 2.027¦ 188.9¦    0.032
     ¦     ¦      ¦      ¦             ¦   30¦ 5668¦ 2.039¦ 192.4¦    0.016
 4 00¦ 5624¦ 2.023¦ 185.3¦    0.038    ¦   40¦ 5723¦ 2.059¦ 195.9¦      -      
                                         
   T - universal time (TDT-UT1= 67.0s);
   s - the angular distance between the centers of the Moon and the shadow;
   d - the linear distance between the Moon's center and that of the shadow
       in terms of the shadow's radius;
   P - the position angle of the Moon's disk semi-diameter directed towards
       the shadow's center.