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A partial solar eclipse occurred at the Moon's ascending node of orbit on Sunday, September 13, 2015,[1][2][3][4] with a magnitude of 0.7875. 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 partial solar eclipse occurs in the polar regions of the Earth when the center of the Moon's shadow misses the Earth.
A partial eclipse was visible for parts of Southern Africa and East Antarctica.
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 Animated path |
 View from center of sun |
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.[5]
| Event | Time (UTC) |
|---|---|
| First Penumbral External Contact | 2015 September 13 at 04:42:47.9 UTC |
| Ecliptic Conjunction | 2015 September 13 at 06:42:23.9 UTC |
| Greatest Eclipse | 2015 September 13 at 06:55:19.2 UTC |
| Equatorial Conjunction | 2015 September 13 at 07:36:27.0 UTC |
| Last Penumbral External Contact | 2015 September 13 at 09:07:32.8 UTC |
| Parameter | Value |
|---|---|
| Eclipse Magnitude | 0.78750 |
| Eclipse Obscuration | 0.70966 |
| Gamma | −1.10039 |
| Sun Right Ascension | 11h23m54.6s |
| Sun Declination | +03°53'20.1" |
| Sun Semi-Diameter | 15'53.6" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 11h22m43.3s |
| Moon Declination | +02°56'47.8" |
| Moon Semi-Diameter | 14'43.0" |
| Moon Equatorial Horizontal Parallax | 0°54'00.6" |
| ΔT | 67.8 s |
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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.
| September 13 Ascending node (new moon) | September 28 Descending node (full moon) |
|---|---|
 |  |
| Partial solar eclipse Solar Saros 125 | Total lunar eclipse Lunar Saros 137 |
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Eclipses in 2015
- A total solar eclipse on March 20.
- A total lunar eclipse on April 4.
- A partial solar eclipse on September 13.
- A total lunar eclipse on September 28.
Metonic
- Preceded by: Solar eclipse of November 25, 2011
- Followed by: Solar eclipse of July 2, 2019
Tzolkinex
- Preceded by: Solar eclipse of August 1, 2008
- Followed by: Solar eclipse of October 25, 2022
Half-Saros
- Preceded by: Lunar eclipse of September 7, 2006
- Followed by: Lunar eclipse of September 18, 2024
Tritos
- Preceded by: Solar eclipse of October 14, 2004
- Followed by: Solar eclipse of August 12, 2026
Solar Saros 125
- Preceded by: Solar eclipse of September 2, 1997
- Followed by: Solar eclipse of September 23, 2033
Inex
- Preceded by: Solar eclipse of October 3, 1986
- Followed by: Solar eclipse of August 23, 2044
Triad
- Preceded by: Solar eclipse of November 12, 1928
- Followed by: Solar eclipse of July 15, 2102
Solar eclipses of 2015–2018
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.[6]
The partial solar eclipse on July 13, 2018 occurs in the next lunar year eclipse set.
| Solar eclipse series sets from 2015 to 2018 | ||||||
|---|---|---|---|---|---|---|
| Descending node | Ascending node | |||||
| Saros | Map | Gamma | Saros | Map | Gamma | |
120._(32844461616).jpg) Totality in Longyearbyen, Svalbard |
March 20, 2015 Total |
0.94536 | 125.jpg) Solar Dynamics Observatory |
September 13, 2015 Partial |
−1.10039 | |
130 Balikpapan, Indonesia |
March 9, 2016 Total |
0.26092 | 135 Annularity in L'Étang-Salé, Réunion |
September 1, 2016 Annular |
−0.33301 | |
140 Partial from Buenos Aires, Argentina |
February 26, 2017 Annular |
−0.45780 | 145_-_square_crop.jpg) Totality in Madras, OR, USA |
August 21, 2017 Total |
0.43671 | |
150.jpg) Partial in Olivos, Buenos Aires, Argentina |
February 15, 2018 Partial |
−1.21163 | 155.jpg) Partial in Huittinen, Finland |
August 11, 2018 Partial |
1.14758 | |
Saros 125
This eclipse is a part of Saros series 125, repeating every 18 years, 11 days, and containing 73 events. The series started with a partial solar eclipse on February 4, 1060. It contains total eclipses from June 13, 1276 through July 16, 1330; hybrid eclipses on July 26, 1348 and August 7, 1366; and annular eclipses from August 17, 1384 through August 22, 1979. The series ends at member 73 as a partial eclipse on April 9, 2358. 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 14 at 1 minutes, 11 seconds on June 25, 1294, and the longest duration of annularity was produced by member 48 at 7 minutes, 23 seconds on July 10, 1907. All eclipses in this series occur at the Moon’s ascending node of orbit.[7]
| Series members 43–64 occur between 1801 and 2200: | ||
|---|---|---|
| 43 | 44 | 45 |
 May 16, 1817 |
 May 27, 1835 |
 June 6, 1853 |
| 46 | 47 | 48 |
 June 18, 1871 |
 June 28, 1889 |
 July 10, 1907 |
| 49 | 50 | 51 |
 July 20, 1925 |
 August 1, 1943 |
 August 11, 1961 |
| 52 | 53 | 54 |
 August 22, 1979 |
 September 2, 1997 |
September 13, 2015 |
| 55 | 56 | 57 |
 September 23, 2033 |
 October 4, 2051 |
 October 15, 2069 |
| 58 | 59 | 60 |
 October 26, 2087 |
 November 6, 2105 |
 November 18, 2123 |
| 61 | 62 | 63 |
 November 28, 2141 |
 December 9, 2159 |
 December 20, 2177 |
| 64 | ||
 December 31, 2195 | ||
Metonic series
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.
| 21 eclipse events between July 1, 2000 and July 1, 2076 | ||||
|---|---|---|---|---|
| July 1–2 | April 19–20 | February 5–7 | November 24–25 | September 12–13 |
| 117 | 119 | 121 | 123 | 125 |
 July 1, 2000 |
 April 19, 2004 |
 February 7, 2008 |
 November 25, 2011 |
September 13, 2015 |
| 127 | 129 | 131 | 133 | 135 |
 July 2, 2019 |
 April 20, 2023 |
 February 6, 2027 |
 November 25, 2030 |
 September 12, 2034 |
| 137 | 139 | 141 | 143 | 145 |
 July 2, 2038 |
 April 20, 2042 |
 February 5, 2046 |
 November 25, 2049 |
 September 12, 2053 |
| 147 | 149 | 151 | 153 | 155 |
 July 1, 2057 |
 April 20, 2061 |
 February 5, 2065 |
 November 24, 2068 |
 September 12, 2072 |
| 157 | ||||
 July 1, 2076 | ||||
Tritos series
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 | ||||
|---|---|---|---|---|
 March 25, 1819 (Saros 107) |
 February 23, 1830 (Saros 108) |
 January 22, 1841 (Saros 109) |
 November 21, 1862 (Saros 111) | |
 August 20, 1895 (Saros 114) |
 July 21, 1906 (Saros 115) |
 June 19, 1917 (Saros 116) | ||
 May 19, 1928 (Saros 117) |
 April 19, 1939 (Saros 118) |
 March 18, 1950 (Saros 119) |
 February 15, 1961 (Saros 120) |
 January 16, 1972 (Saros 121) |
 December 15, 1982 (Saros 122) |
 November 13, 1993 (Saros 123) |
 October 14, 2004 (Saros 124) |
September 13, 2015 (Saros 125) |
 August 12, 2026 (Saros 126) |
 July 13, 2037 (Saros 127) |
 June 11, 2048 (Saros 128) |
 May 11, 2059 (Saros 129) |
 April 11, 2070 (Saros 130) |
 March 10, 2081 (Saros 131) |
 February 7, 2092 (Saros 132) |
 January 8, 2103 (Saros 133) |
 December 8, 2113 (Saros 134) |
 November 6, 2124 (Saros 135) |
 October 7, 2135 (Saros 136) |
 September 6, 2146 (Saros 137) |
 August 5, 2157 (Saros 138) |
 July 5, 2168 (Saros 139) |
 June 5, 2179 (Saros 140) |
 May 4, 2190 (Saros 141) |
Inex series
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 | ||
|---|---|---|
 February 1, 1813 (Saros 118) |
 January 11, 1842 (Saros 119) |
 December 22, 1870 (Saros 120) |
 December 3, 1899 (Saros 121) |
 November 12, 1928 (Saros 122) |
 October 23, 1957 (Saros 123) |
 October 3, 1986 (Saros 124) |
September 13, 2015 (Saros 125) |
 August 23, 2044 (Saros 126) |
 August 3, 2073 (Saros 127) |
 July 15, 2102 (Saros 128) |
 June 25, 2131 (Saros 129) |
 June 4, 2160 (Saros 130) |
 May 15, 2189 (Saros 131) |
|
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