Solar eclipse of May 9, 1929

A total solar eclipse occurred at the Moon's ascending node of orbit on Thursday, May 9, 1929,[1] with a magnitude of 1.0562. A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the image of the Sun for a viewer on Earth. A total solar eclipse occurs when the Moon's apparent diameter is larger than the Sun's, blocking all direct sunlight, turning day into darkness. Totality occurs in a narrow path across Earth's surface, with the partial solar eclipse visible over a surrounding region thousands of kilometres wide. Occurring about 1.7 days before perigee (on May 10, 1929, at 21:00 UTC), the Moon's apparent diameter was larger.[2]

Solar eclipse of May 9, 1929
Map
Type of eclipse
NatureTotal
Gamma−0.2887
Magnitude1.0562
Maximum eclipse
Duration307 s (5 min 7 s)
Coordinates1°36′N 92°42′E / 1.6°N 92.7°E / 1.6; 92.7
Max. width of band193 km (120 mi)
Times (UTC)
Greatest eclipse6:10:34
References
Saros127 (53 of 82)
Catalog # (SE5000)9349

Totality was visible from Dutch East Indies (today's Indonesia), Federated Malay States (now belonging to Malaysia), Siam (name changed to Thailand later), French Indochina (the part now belonging to Vietnam), Spratly Islands, Philippines, and South Seas Mandate in Japan (the part now belonging to FS Micronesia). A partial eclipse was visible for parts of Southeast Africa, South Asia, Southeast Asia, East Asia, and Australia..

Observations

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A team of British and German scientists observed the total eclipse in Pattani province in southern Siam. King Rama VII and Queen Rambai Barni also visited the observation camp set up by foreign scientists and observed the eclipse together in Pattani. This was the last time that Siam (Thailand) received a large-scale solar eclipse observation team so far. The other teams Thailand received later, including the American team for the total solar eclipse of June 20, 1955 were much smaller.[3]

Eclipse details

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Shown below are two tables displaying details about this particular solar eclipse. The first table outlines times at which the moon's penumbra or umbra attains the specific parameter, and the second table describes various other parameters pertaining to this eclipse.[4]

May 9, 1929 Solar Eclipse Times
Event Time (UTC)
First Penumbral External Contact 1929 May 09 at 03:32:58.0 UTC
First Umbral External Contact 1929 May 09 at 04:29:32.5 UTC
First Central Line 1929 May 09 at 04:30:38.2 UTC
First Umbral Internal Contact 1929 May 09 at 04:31:43.9 UTC
First Penumbral Internal Contact 1929 May 09 at 05:32:55.2 UTC
Equatorial Conjunction 1929 May 09 at 05:58:29.8 UTC
Ecliptic Conjunction 1929 May 09 at 06:07:34.8 UTC
Greatest Eclipse 1929 May 09 at 06:10:34.1 UTC
Greatest Duration 1929 May 09 at 06:17:47.1 UTC
Last Penumbral Internal Contact 1929 May 09 at 06:48:30.3 UTC
Last Umbral Internal Contact 1929 May 09 at 07:49:29.9 UTC
Last Central Line 1929 May 09 at 07:50:37.4 UTC
Last Umbral External Contact 1929 May 09 at 07:51:44.7 UTC
Last Penumbral External Contact 1929 May 09 at 08:48:11.5 UTC
May 9, 1929 Solar Eclipse Parameters
Parameter Value
Eclipse Magnitude 1.05622
Eclipse Obscuration 1.11560
Gamma −0.28869
Sun Right Ascension 03h02m38.7s
Sun Declination +17°14'10.1"
Sun Semi-Diameter 15'50.3"
Sun Equatorial Horizontal Parallax 08.7"
Moon Right Ascension 03h03m05.7s
Moon Declination +16°58'00.8"
Moon Semi-Diameter 16'27.7"
Moon Equatorial Horizontal Parallax 1°00'24.9"
ΔT 24.0 s

Eclipse season

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This eclipse is part of an eclipse season, a period, roughly every six months, when eclipses occur. Only two (or occasionally three) eclipse seasons occur each year, and each season lasts about 35 days and repeats just short of six months (173 days) later; thus two full eclipse seasons always occur each year. Either two or three eclipses happen each eclipse season. In the sequence below, each eclipse is separated by a fortnight.

Eclipse season of May 1929
May 9
Ascending node (new moon)
May 23
Descending node (full moon)
   
Total solar eclipse
Solar Saros 127
Penumbral lunar eclipse
Lunar Saros 139
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Eclipses in 1929

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Metonic

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Tzolkinex

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Half-Saros

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Tritos

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Solar Saros 127

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Inex

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Triad

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Solar eclipses of 1928–1931

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This eclipse is a member of a semester series. An eclipse in a semester series of solar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternating nodes of the Moon's orbit.[5]

The partial solar eclipse on June 17, 1928 occurs in the previous lunar year eclipse set, and the partial solar eclipse on September 12, 1931 occurs in the next lunar year eclipse set.

Solar eclipse series sets from 1928 to 1931
Ascending node   Descending node
Saros Map Gamma Saros Map Gamma
117 May 19, 1928
 
Total (non-central)
1.0048 122 November 12, 1928
 
Partial
1.0861
127 May 9, 1929
 
Total
−0.2887 132 November 1, 1929
 
Annular
0.3514
137 April 28, 1930
 
Hybrid
0.473 142 October 21, 1930
 
Total
−0.3804
147 April 18, 1931
 
Partial
1.2643 152 October 11, 1931
 
Partial
−1.0607

Saros 127

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This eclipse is a part of Saros series 127, repeating every 18 years, 11 days, and containing 82 events. The series started with a partial solar eclipse on October 10, 991 AD. It contains total eclipses from May 14, 1352 through August 15, 2091. There are no annular or hybrid eclipses in this set. The series ends at member 82 as a partial eclipse on March 21, 2452. Its eclipses are tabulated in three columns; every third eclipse in the same column is one exeligmos apart, so they all cast shadows over approximately the same parts of the Earth.

The longest duration of totality was produced by member 31 at 5 minutes, 40 seconds on August 30, 1532. All eclipses in this series occur at the Moon’s ascending node of orbit.[6]

Series members 46–68 occur between 1801 and 2200:
46 47 48
 
February 21, 1803
 
March 4, 1821
 
March 15, 1839
49 50 51
 
March 25, 1857
 
April 6, 1875
 
April 16, 1893
52 53 54
 
April 28, 1911
 
May 9, 1929
 
May 20, 1947
55 56 57
 
May 30, 1965
 
June 11, 1983
 
June 21, 2001
58 59 60
 
July 2, 2019
 
July 13, 2037
 
July 24, 2055
61 62 63
 
August 3, 2073
 
August 15, 2091
 
August 26, 2109
64 65 66
 
September 6, 2127
 
September 16, 2145
 
September 28, 2163
67 68
 
October 8, 2181
 
October 19, 2199

Metonic series

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The metonic series repeats eclipses every 19 years (6939.69 days), lasting about 5 cycles. Eclipses occur in nearly the same calendar date. In addition, the octon subseries repeats 1/5 of that or every 3.8 years (1387.94 days). All eclipses in this table occur at the Moon's ascending node.

22 eclipse events between December 13, 1898 and July 20, 1982
December 13–14 October 1–2 July 20–21 May 9 February 24–25
111 113 115 117 119
 
December 13, 1898
 
July 21, 1906
 
May 9, 1910
 
February 25, 1914
121 123 125 127 129
 
December 14, 1917
 
October 1, 1921
 
July 20, 1925
 
May 9, 1929
 
February 24, 1933
131 133 135 137 139
 
December 13, 1936
 
October 1, 1940
 
July 20, 1944
 
May 9, 1948
 
February 25, 1952
141 143 145 147 149
 
December 14, 1955
 
October 2, 1959
 
July 20, 1963
 
May 9, 1967
 
February 25, 1971
151 153 155
 
December 13, 1974
 
October 2, 1978
 
July 20, 1982

Tritos series

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This eclipse is a part of a tritos cycle, repeating at alternating nodes every 135 synodic months (≈ 3986.63 days, or 11 years minus 1 month). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee), but groupings of 3 tritos cycles (≈ 33 years minus 3 months) come close (≈ 434.044 anomalistic months), so eclipses are similar in these groupings.

Series members between 1801 and 2200
 
April 14, 1809
(Saros 116)
 
March 14, 1820
(Saros 117)
 
February 12, 1831
(Saros 118)
 
January 11, 1842
(Saros 119)
 
December 11, 1852
(Saros 120)
 
November 11, 1863
(Saros 121)
 
October 10, 1874
(Saros 122)
 
September 8, 1885
(Saros 123)
 
August 9, 1896
(Saros 124)
 
July 10, 1907
(Saros 125)
 
June 8, 1918
(Saros 126)
 
May 9, 1929
(Saros 127)
 
April 7, 1940
(Saros 128)
 
March 7, 1951
(Saros 129)
 
February 5, 1962
(Saros 130)
 
January 4, 1973
(Saros 131)
 
December 4, 1983
(Saros 132)
 
November 3, 1994
(Saros 133)
 
October 3, 2005
(Saros 134)
 
September 1, 2016
(Saros 135)
 
August 2, 2027
(Saros 136)
 
July 2, 2038
(Saros 137)
 
May 31, 2049
(Saros 138)
 
April 30, 2060
(Saros 139)
 
March 31, 2071
(Saros 140)
 
February 27, 2082
(Saros 141)
 
January 27, 2093
(Saros 142)
 
December 29, 2103
(Saros 143)
 
November 27, 2114
(Saros 144)
 
October 26, 2125
(Saros 145)
 
September 26, 2136
(Saros 146)
 
August 26, 2147
(Saros 147)
 
July 25, 2158
(Saros 148)
 
June 25, 2169
(Saros 149)
 
May 24, 2180
(Saros 150)
 
April 23, 2191
(Saros 151)

Inex series

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This eclipse is a part of the long period inex cycle, repeating at alternating nodes, every 358 synodic months (≈ 10,571.95 days, or 29 years minus 20 days). Their appearance and longitude are irregular due to a lack of synchronization with the anomalistic month (period of perigee). However, groupings of 3 inex cycles (≈ 87 years minus 2 months) comes close (≈ 1,151.02 anomalistic months), so eclipses are similar in these groupings.

Series members between 1801 and 2200
 
July 27, 1813
(Saros 123)
 
July 8, 1842
(Saros 124)
 
June 18, 1871
(Saros 125)
 
May 28, 1900
(Saros 126)
 
May 9, 1929
(Saros 127)
 
April 19, 1958
(Saros 128)
 
March 29, 1987
(Saros 129)
 
March 9, 2016
(Saros 130)
 
February 16, 2045
(Saros 131)
 
January 27, 2074
(Saros 132)
 
January 8, 2103
(Saros 133)
 
December 19, 2131
(Saros 134)
 
November 27, 2160
(Saros 135)
 
November 8, 2189
(Saros 136)

References

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  1. ^ "May 9, 1929 Total Solar Eclipse". timeanddate. Retrieved 3 August 2024.
  2. ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 3 August 2024.
  3. ^ "SOLAR ECLIPSES IN SIAM (THAILAND)". National Astronomical Research Institute of Thailand. Archived from the original on 30 March 2016.
  4. ^ "Total Solar Eclipse of 1929 May 09". EclipseWise.com. Retrieved 3 August 2024.
  5. ^ van Gent, R.H. "Solar- and Lunar-Eclipse Predictions from Antiquity to the Present". A Catalogue of Eclipse Cycles. Utrecht University. Retrieved 6 October 2018.
  6. ^ "NASA - Catalog of Solar Eclipses of Saros 127". eclipse.gsfc.nasa.gov.
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