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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

---------T-----------T----------------------
ContactsТ? Position Т?The Moon being in the Zenith in
of penum.Т? Angles +----------T-----------
with LimbТ? from the Т? Т? Magnitude of the eclipse 0.038
of Moon Т?North PointТ? Latitude Т? Longitude "
---------+-----------+----------+----------- Angular radius of the penumbra 4711.53
Т? o ' Т? o ' Т? o ' "
First Т? 176 03.7 Т? -19 30.4 Т? 56 52.0 W Angular radius of the umbra 2779.38
Last Т? 194 36.1 Т? -19 33.6 Т? 69 26.0 W

-----T-----T------T------T-------------T-----T-----T------T------T-------------
Т? Т? Т? Т?Magnitudes ofТ? Т? Т? Т? Т?Magnitudes of
T Т? s Т? d Т? P Т? penumbral Т? T Т? s Т? d Т? P Т? penumbral
Т? Т? Т? Т? eclipse Т? Т? Т? Т? Т? eclipse
-----+-----+------+------+-------------+-----+-----+------+------+-------------
h mТ? "Т? Т? ТА Т? Т? h mТ? "Т? Т? ТА Т?
3 40Т? 5723Т? 2.059Т? 174.7Т? - Т? 4 10Т? 5624Т? 2.023Т? 173.2Т? 0.043
50Т? 5668Т? 2.040Т? 178.2Т? 0.016 Т? 20Т? 5635Т? 2.027Т? 188.9Т? 0.032
Т? Т? Т? Т? Т? 30Т? 5668Т? 2.039Т? 192.4Т? 0.016
4 00Т? 5624Т? 2.023Т? 185.3Т? 0.038 Т? 40Т? 5723Т? 2.059Т? 195.9Т? -

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.