| Annular eclipse | |
 Map | |
| Gamma | −0.7193 |
|---|---|
| Magnitude | 0.9436 |
| Maximum eclipse | |
| Duration | 435 s (7 min 15 s) |
| Coordinates | 25°18′S150°00′W / 25.3°S 150°W /-25.3; -150 |
| Max. width of band | 300 km (190 mi) |
| Times (UTC) | |
| Greatest eclipse | 21:48:42 |
| References | |
| Saros | 125 (49 of 73) |
| Catalog # (SE5000) | 9340 |
An annularsolar eclipse occurred at the Moon'sascending node of orbit between Monday, July 20 and Tuesday, July 21, 1925,[1] with amagnitude of 0.9436. Asolar eclipse occurs when theMoon passes betweenEarth and theSun, thereby totally or partly obscuring the image of the Sun for a viewer on Earth. An annular solar eclipse occurs when the Moon'sapparent diameter is smaller than the Sun's, blocking most of the Sun's light and causing the Sun to look like anannulus (ring). An annular eclipse appears as a partial eclipse over a region of the Earth thousands of kilometres wide. Occurring about 8 hours afterapogee (on July 20, 1925, at 13:30 UTC), the Moon's apparent diameter was smaller.[2]
Annularity was visible from northern part ofNorthland Region and the wholeKermadec Islands inNew Zealand on July 21 (Tuesday), andRapa Iti inFrench Polynesia on July 20 (Monday). A partial eclipse was visible for parts ofEastern Australia andOceania.
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.[3]
| Event | Time (UTC) |
|---|---|
| First Penumbral External Contact | 1925 July 20 at 19:03:41.7 UTC |
| First Umbral External Contact | 1925 July 20 at 20:23:08.9 UTC |
| First Central Line | 1925 July 20 at 20:26:27.5 UTC |
| First Umbral Internal Contact | 1925 July 20 at 20:29:50.5 UTC |
| Ecliptic Conjunction | 1925 July 20 at 21:40:09.2 UTC |
| Greatest Duration | 1925 July 20 at 21:46:03.5 UTC |
| Greatest Eclipse | 1925 July 20 at 21:48:41.6 UTC |
| Equatorial Conjunction | 1925 July 20 at 21:57:08.7 UTC |
| Last Umbral Internal Contact | 1925 July 20 at 23:07:26.9 UTC |
| Last Central Line | 1925 July 20 at 23:10:49.8 UTC |
| Last Umbral External Contact | 1925 July 20 at 23:14:08.3 UTC |
| Last Penumbral External Contact | 1925 July 21 at 00:33:37.3 UTC |
| Parameter | Value |
|---|---|
| Eclipse Magnitude | 0.94358 |
| Eclipse Obscuration | 0.89035 |
| Gamma | −0.71927 |
| Sun Right Ascension | 07h58m46.0s |
| Sun Declination | +20°38'42.8" |
| Sun Semi-Diameter | 15'44.4" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 07h58m29.8s |
| Moon Declination | +20°00'11.9" |
| Moon Semi-Diameter | 14'42.0" |
| Moon Equatorial Horizontal Parallax | 0°53'57.1" |
| ΔT | 23.7 s |
This eclipse is part of aneclipse 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 afortnight.
| July 20 Ascending node (new moon) | August 4 Descending node (full moon) |
|---|---|
|  |
| Annular solar eclipse Solar Saros 125 | Partial lunar eclipse Lunar Saros 137 |
This eclipse is a member of asemester series. An eclipse in a semester series of solar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternatingnodes of the Moon's orbit.[4]
The partial solar eclipses onMarch 5, 1924 andAugust 30, 1924 occur in the previous lunar year eclipse set, and the solar eclipses onMay 19, 1928 andNovember 12, 1928 occur in the next lunar year eclipse set.
| Solar eclipse series sets from 1924 to 1928 | ||||||
|---|---|---|---|---|---|---|
| Ascending node | Descending node | |||||
| Saros | Map | Gamma | Saros | Map | Gamma | |
| 115 | July 31, 1924 Partial | −1.4459 | 120 | January 24, 1925 Total | 0.8661 | |
| 125 | July 20, 1925 Annular | −0.7193 | 130 Totality inSumatra, Indonesia | January 14, 1926 Total | 0.1973 | |
| 135 | July 9, 1926 Annular | 0.0538 | 140 | January 3, 1927 Annular | −0.4956 | |
| 145 | June 29, 1927 Total | 0.8163 | 150 | December 24, 1927 Partial | −1.2416 | |
| 155 | June 17, 1928 Partial | 1.5107 | ||||
This eclipse is a part ofSaros 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 throughAugust 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 oneexeligmos 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 onJuly 10, 1907. All eclipses in this series occur at the Moon’sascending node of orbit.[5]
| 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 | ||
Themetonic 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 | ||
This eclipse is a part of atritos cycle, repeating at alternating nodes every 135synodic months (≈ 3986.63 days, or 11 years minus 1 month). Their appearance and longitude are irregular due to a lack of synchronization with theanomalistic 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 | ||||
|---|---|---|---|---|
 June 26, 1805 (Saros 114) |  May 27, 1816 (Saros 115) |  April 26, 1827 (Saros 116) |  March 25, 1838 (Saros 117) |  February 23, 1849 (Saros 118) |
 January 23, 1860 (Saros 119) |  December 22, 1870 (Saros 120) |  November 21, 1881 (Saros 121) |  October 20, 1892 (Saros 122) |  September 21, 1903 (Saros 123) |
 August 21, 1914 (Saros 124) | July 20, 1925 (Saros 125) |  June 19, 1936 (Saros 126) |  May 20, 1947 (Saros 127) |  April 19, 1958 (Saros 128) |
 March 18, 1969 (Saros 129) |  February 16, 1980 (Saros 130) |  January 15, 1991 (Saros 131) |  December 14, 2001 (Saros 132) |  November 13, 2012 (Saros 133) |
 October 14, 2023 (Saros 134) |  September 12, 2034 (Saros 135) |  August 12, 2045 (Saros 136) |  July 12, 2056 (Saros 137) |  June 11, 2067 (Saros 138) |
 May 11, 2078 (Saros 139) |  April 10, 2089 (Saros 140) |  March 10, 2100 (Saros 141) |  February 8, 2111 (Saros 142) |  January 8, 2122 (Saros 143) |
 December 7, 2132 (Saros 144) |  November 7, 2143 (Saros 145) |  October 7, 2154 (Saros 146) |  September 5, 2165 (Saros 147) |  August 4, 2176 (Saros 148) |
 July 6, 2187 (Saros 149) |  June 4, 2198 (Saros 150) | |||
This eclipse is a part of the long periodinex cycle, repeating at alternating nodes, every 358synodic months (≈ 10,571.95 days, or 29 years minus 20 days). Their appearance and longitude are irregular due to a lack of synchronization with theanomalistic 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 | ||
|---|---|---|
 October 9, 1809 (Saros 121) |  September 18, 1838 (Saros 122) |  August 29, 1867 (Saros 123) |
 August 9, 1896 (Saros 124) | July 20, 1925 (Saros 125) |  June 30, 1954 (Saros 126) |
 June 11, 1983 (Saros 127) |  May 20, 2012 (Saros 128) |  April 30, 2041 (Saros 129) |
 April 11, 2070 (Saros 130) |  March 21, 2099 (Saros 131) |  March 1, 2128 (Saros 132) |
 February 9, 2157 (Saros 133) |  January 20, 2186 (Saros 134) | |
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