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Solar eclipse of August 17, 1803

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Solar eclipse of August 17, 1803
Map
Type of eclipse
NatureAnnular
Gamma−0.0048
Magnitude0.9657
Maximum eclipse
Duration227 s (3 min 47 s)
Coordinates13°36′N 54°42′E / 13.6°N 54.7°E / 13.6; 54.7
Max. width of band124 km (77 mi)
Times (UTC)
Greatest eclipse8:25:03
References
Saros132 (34 of 71)
Catalog # (SE5000)9048

An annular solar eclipse occurred at the Moon's descending node of orbit on Wednesday, August 17, 1803, with a magnitude of 0.9657. 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. An annular solar eclipse occurs when the Moon's apparent diameter is smaller than the Sun's, blocking most of the Sun's light and causing the Sun to look like an annulus (ring). An annular eclipse appears as a partial eclipse over a region of the Earth thousands of kilometres wide. Occurring about 4.5 days before apogee (on August 21, 1803, at 19:20 UTC), the Moon's apparent diameter was smaller.[1]

The path of annularity was visible from parts of modern-day Western Sahara, Mauritania, far northern Mali, Algeria, Libya, Egypt, Saudi Arabia, and Yemen. A partial solar eclipse was also visible for parts of Europe, North Africa, Central Africa, the Middle East, South Asia, and Southeast Asia.[2] It was the first solar eclipse to be subject to detailed spectroscopic study.[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]

August 17, 1803 Solar Eclipse Times
Event Time (UTC)
First Penumbral External Contact 1803 August 17 at 05:24:35.4 UTC
First Umbral External Contact 1803 August 17 at 06:27:46.8 UTC
First Central Line 1803 August 17 at 06:29:24.5 UTC
First Umbral Internal Contact 1803 August 17 at 06:31:02.3 UTC
First Penumbral Internal Contact 1803 August 17 at 07:34:15.4 UTC
Greatest Duration 1803 August 17 at 07:56:21.3 UTC
Greatest Eclipse 1803 August 17 at 08:25:03.0 UTC
Ecliptic Conjunction 1803 August 17 at 08:25:06.3 UTC
Equatorial Conjunction 1803 August 17 at 08:25:18.6 UTC
Last Penumbral Internal Contact 1803 August 17 at 09:15:49.4 UTC
Last Umbral Internal Contact 1803 August 17 at 10:19:01.8 UTC
Last Central Line 1803 August 17 at 10:20:42.0 UTC
Last Umbral External Contact 1803 August 17 at 10:22:22.3 UTC
Last Penumbral External Contact 1803 August 17 at 11:25:36.2 UTC
August 17, 1803 Solar Eclipse Parameters
Parameter Value
Eclipse Magnitude 0.96571
Eclipse Obscuration 0.93259
Gamma −0.00483
Sun Right Ascension 09h43m00.2s
Sun Declination +13°43'47.1"
Sun Semi-Diameter 15'48.3"
Sun Equatorial Horizontal Parallax 08.7"
Moon Right Ascension 09h42m59.7s
Moon Declination +13°43'32.7"
Moon Semi-Diameter 15'01.8"
Moon Equatorial Horizontal Parallax 0°55'09.5"
ΔT 12.4 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. The first and last eclipse in this sequence is separated by one synodic month.

Eclipse season of August–September 1803
August 3
Ascending node (full moon)
August 17
Descending node (new moon)
September 1
Ascending node (full moon)
Penumbral lunar eclipse
Lunar Saros 106
Annular solar eclipse
Solar Saros 132
Penumbral lunar eclipse
Lunar Saros 144
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Eclipses in 1803

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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 132

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Inex

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Triad

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Solar eclipses of 1801–1805

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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 eclipses on April 13, 1801 and October 7, 1801 occur in the previous lunar year eclipse set, and the solar eclipses on January 1, 1805 (partial); June 26, 1805 (partial); and December 21, 1805 (annular) occur in the next lunar year eclipse set.

Solar eclipse series sets from 1801 to 1805
Ascending node   Descending node
Saros Map Gamma Saros Map Gamma
107 March 14, 1801

Partial
−1.4434 112 September 8, 1801

Partial
1.4657
117 March 4, 1802

Total
−0.6943 122 August 28, 1802

Annular
0.7569
127 February 21, 1803

Total
−0.0075 132 August 17, 1803

Annular
−0.0048
137 February 11, 1804

Hybrid
0.7053 142 August 5, 1804

Total
−0.7622
147 January 30, 1805

Partial
1.4651 152 July 26, 1805

Partial
−1.4571

Saros 132

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This eclipse is a part of Saros series 132, repeating every 18 years, 11 days, and containing 71 events. The series started with a partial solar eclipse on August 13, 1208. It contains annular eclipses from March 17, 1569 through March 12, 2146; hybrid eclipses on March 23, 2164 and April 3, 2182; and total eclipses from April 14, 2200 through June 19, 2308. The series ends at member 71 as a partial eclipse on September 25, 2470. 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 annularity was produced by member 25 at 6 minutes, 56 seconds on May 9, 1641, and the longest duration of totality will be produced by member 61 at 2 minutes, 14 seconds on June 8, 2290. All eclipses in this series occur at the Moon’s descending node of orbit.[6]

Series members 34–56 occur between 1801 and 2200:
34 35 36

August 17, 1803

August 27, 1821

September 7, 1839
37 38 39

September 18, 1857

September 29, 1875

October 9, 1893
40 41 42

October 22, 1911

November 1, 1929

November 12, 1947
43 44 45

November 23, 1965

December 4, 1983

December 14, 2001
46 47 48

December 26, 2019

January 5, 2038

January 16, 2056
49 50 51

January 27, 2074

February 7, 2092

February 18, 2110
52 53 54

March 1, 2128

March 12, 2146

March 23, 2164
55 56

April 3, 2182

April 14, 2200

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 descending node.

24 eclipse events between August 17, 1803 and August 16, 1841
August 16–17 June 5–6 March 24 January 9–10 October 29
132 134 136 138 140

August 17, 1803

June 6, 1807

March 24, 1811

January 10, 1815

October 29, 1818
142 144 146 148 150

August 16, 1822

June 5, 1826

March 24, 1830

January 9, 1834

October 29, 1837
152

August 16, 1841

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 2087

August 17, 1803
(Saros 132)

July 17, 1814
(Saros 133)

June 16, 1825
(Saros 134)

May 15, 1836
(Saros 135)

April 15, 1847
(Saros 136)

March 15, 1858
(Saros 137)

February 11, 1869
(Saros 138)

January 11, 1880
(Saros 139)

December 12, 1890
(Saros 140)

November 11, 1901
(Saros 141)

October 10, 1912
(Saros 142)

September 10, 1923
(Saros 143)

August 10, 1934
(Saros 144)

July 9, 1945
(Saros 145)

June 8, 1956
(Saros 146)

May 9, 1967
(Saros 147)

April 7, 1978
(Saros 148)

March 7, 1989
(Saros 149)

February 5, 2000
(Saros 150)

January 4, 2011
(Saros 151)

December 4, 2021
(Saros 152)

November 3, 2032
(Saros 153)

October 3, 2043
(Saros 154)

September 2, 2054
(Saros 155)

August 2, 2065
(Saros 156)

July 1, 2076
(Saros 157)

June 1, 2087
(Saros 158)

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

August 17, 1803
(Saros 132)

July 27, 1832
(Saros 133)

July 8, 1861
(Saros 134)

June 17, 1890
(Saros 135)

May 29, 1919
(Saros 136)

May 9, 1948
(Saros 137)

April 18, 1977
(Saros 138)

March 29, 2006
(Saros 139)

March 9, 2035
(Saros 140)

February 17, 2064
(Saros 141)

January 27, 2093
(Saros 142)

January 8, 2122
(Saros 143)

December 19, 2150
(Saros 144)

November 28, 2179
(Saros 145)

See also

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References

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  1. ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 23 September 2024.
  2. ^ "Solar eclipse of August 17, 1803". NASA. Retrieved June 18, 2012.
  3. ^ Orchiston, Wayne; Orchiston, Darunee Lingling (2017). "King Rama IV and French Observations of the 18 August 1868 Total Solar Eclipse from Wah-koa, Siam". The Emergence of Astrophysics in Asia, Historical & Cultural Astronomy. Springer International Publishing AG. p. 291. Bibcode:2017eaa..book..291O. doi:10.1007/978-3-319-62082-4_12. ISBN 978-3-319-62080-0.
  4. ^ "Annular Solar Eclipse of 1803 Aug 17". EclipseWise.com. Retrieved 23 September 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 132". eclipse.gsfc.nasa.gov.
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