| Annular eclipse | |
 Map | |
| Gamma | 0.2786 |
|---|---|
| Magnitude | 0.9971 |
| Maximum eclipse | |
| Duration | 19 s (0 min 19 s) |
| Coordinates | 7°18′S160°48′W / 7.3°S 160.8°W /-7.3; -160.8 |
| Max. width of band | 10 km (6.2 mi) |
| Times (UTC) | |
| Greatest eclipse | 22:37:48 |
| References | |
| Saros | 143 (27 of 72) |
| Catalog # (SE5000) | 9700 |
An annularsolar eclipse will occur at the Moon'sascending node of orbit between Sunday, December 16 and Monday, December 17, 2085,[1] with amagnitude of 0.9971. 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 3.7 days beforeperigee (on December 20, 2085, at 14:40 UTC), the Moon's apparent diameter will be larger.[2]
The path of annularity will be visible from parts ofMicronesia and southwesternMexico. A partial solar eclipse will also be visible for parts of northernAustralia,Oceania,Hawaii, and westernNorth America.
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 | 2085 December 16 at 19:52:02.9 UTC |
| First Umbral External Contact | 2085 December 16 at 20:52:55.2 UTC |
| First Central Line | 2085 December 16 at 20:53:32.4 UTC |
| Greatest Duration | 2085 December 16 at 20:53:32.4 UTC |
| First Umbral Internal Contact | 2085 December 16 at 20:54:09.7 UTC |
| First Penumbral Internal Contact | 2085 December 16 at 21:59:46.9 UTC |
| Greatest Eclipse | 2085 December 16 at 22:37:47.8 UTC |
| Equatorial Conjunction | 2085 December 16 at 22:39:48.7 UTC |
| Ecliptic Conjunction | 2085 December 16 at 22:40:48.4 UTC |
| Last Penumbral Internal Contact | 2085 December 16 at 23:15:46.8 UTC |
| Last Umbral Internal Contact | 2085 December 17 at 00:21:26.6 UTC |
| Last Central Line | 2085 December 17 at 00:22:01.1 UTC |
| Last Umbral External Contact | 2085 December 17 at 00:22:35.6 UTC |
| Last Penumbral External Contact | 2085 December 17 at 01:23:25.8 UTC |
| Parameter | Value |
|---|---|
| Eclipse Magnitude | 0.99714 |
| Eclipse Obscuration | 0.99428 |
| Gamma | 0.27864 |
| Sun Right Ascension | 17h41m09.8s |
| Sun Declination | -23°21'25.3" |
| Sun Semi-Diameter | 16'15.0" |
| Sun Equatorial Horizontal Parallax | 08.9" |
| Moon Right Ascension | 17h41m05.1s |
| Moon Declination | -23°05'11.3" |
| Moon Semi-Diameter | 15'57.1" |
| Moon Equatorial Horizontal Parallax | 0°58'32.5" |
| ΔT | 110.5 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.
| December 1 Descending node (full moon) | December 16 Ascending node (new moon) |
|---|---|
| |
| Penumbral lunar eclipse Lunar Saros 117 | Annular solar eclipse Solar Saros 143 |
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 onFebruary 16, 2083 andAugust 13, 2083 occur in the previous lunar year eclipse set, and the partial solar eclipses onMay 2, 2087 andOctober 26, 2087 occur in the next lunar year eclipse set.
| Solar eclipse series sets from 2083 to 2087 | ||||||
|---|---|---|---|---|---|---|
| Descending node | Ascending node | |||||
| Saros | Map | Gamma | Saros | Map | Gamma | |
| 118 | July 15, 2083 Partial | 1.5465 | 123 | January 7, 2084 Partial | −1.0715 | |
| 128 | July 3, 2084 Annular | 0.8208 | 133 | December 27, 2084 Total | −0.4094 | |
| 138 | June 22, 2085 Annular | 0.0452 | 143 | December 16, 2085 Annular | 0.2786 | |
| 148 | June 11, 2086 Total | −0.7215 | 153 | December 6, 2086 Partial | 1.0194 | |
| 158 | June 1, 2087 Partial | −1.4186 | ||||
This eclipse is a part ofSaros series 143, repeating every 18 years, 11 days, and containing 72 events. The series started with a partial solar eclipse on March 7, 1617. It contains total eclipses from June 24, 1797 throughOctober 24, 1995; hybrid eclipses fromNovember 3, 2013 throughDecember 6, 2067; and annular eclipses fromDecember 16, 2085 through September 16, 2536. The series ends at member 72 as a partial eclipse on April 23, 2897. 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 16 at 3 minutes, 50 seconds onAugust 19, 1887, and the longest duration of annularity will be produced by member 51 at 4 minutes, 54 seconds on September 6, 2518. All eclipses in this series occur at the Moon’sascending node of orbit.[5]
| Series members 12–33 occur between 1801 and 2200: | ||
|---|---|---|
| 12 | 13 | 14 |
 July 6, 1815 |  July 17, 1833 |  July 28, 1851 |
| 15 | 16 | 17 |
 August 7, 1869 |  August 19, 1887 |  August 30, 1905 |
| 18 | 19 | 20 |
 September 10, 1923 |  September 21, 1941 |  October 2, 1959 |
| 21 | 22 | 23 |
 October 12, 1977 |  October 24, 1995 |  November 3, 2013 |
| 24 | 25 | 26 |
 November 14, 2031 |  November 25, 2049 |  December 6, 2067 |
| 27 | 28 | 29 |
December 16, 2085 |  December 29, 2103 |  January 8, 2122 |
| 30 | 31 | 32 |
 January 20, 2140 |  January 30, 2158 |  February 10, 2176 |
| 33 | ||
 February 21, 2194 | ||
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.
| 21 eclipse events between July 23, 2036 and July 23, 2112 | ||||
|---|---|---|---|---|
| July 23–24 | May 11 | February 27–28 | December 16–17 | October 4–5 |
| 117 | 119 | 121 | 123 | 125 |
 July 23, 2036 |  May 11, 2040 |  February 28, 2044 |  December 16, 2047 |  October 4, 2051 |
| 127 | 129 | 131 | 133 | 135 |
 July 24, 2055 |  May 11, 2059 |  February 28, 2063 |  December 17, 2066 |  October 4, 2070 |
| 137 | 139 | 141 | 143 | 145 |
 July 24, 2074 |  May 11, 2078 |  February 27, 2082 | December 16, 2085 |  October 4, 2089 |
| 147 | 149 | 151 | 153 | 155 |
 July 23, 2093 |  May 11, 2097 |  February 28, 2101 |  December 17, 2104 |  October 5, 2108 |
| 157 | ||||
 July 23, 2112 | ||||
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 | ||||
|---|---|---|---|---|
 March 4, 1802 (Saros 117) |  February 1, 1813 (Saros 118) |  January 1, 1824 (Saros 119) |  November 30, 1834 (Saros 120) |  October 30, 1845 (Saros 121) |
 September 29, 1856 (Saros 122) |  August 29, 1867 (Saros 123) |  July 29, 1878 (Saros 124) |  June 28, 1889 (Saros 125) |  May 28, 1900 (Saros 126) |
 April 28, 1911 (Saros 127) |  March 28, 1922 (Saros 128) |  February 24, 1933 (Saros 129) |  January 25, 1944 (Saros 130) |  December 25, 1954 (Saros 131) |
 November 23, 1965 (Saros 132) |  October 23, 1976 (Saros 133) |  September 23, 1987 (Saros 134) |  August 22, 1998 (Saros 135) |  July 22, 2009 (Saros 136) |
 June 21, 2020 (Saros 137) |  May 21, 2031 (Saros 138) |  April 20, 2042 (Saros 139) |  March 20, 2053 (Saros 140) |  February 17, 2064 (Saros 141) |
 January 16, 2075 (Saros 142) | December 16, 2085 (Saros 143) |  November 15, 2096 (Saros 144) |  October 16, 2107 (Saros 145) |  September 15, 2118 (Saros 146) |
 August 15, 2129 (Saros 147) |  July 14, 2140 (Saros 148) |  June 14, 2151 (Saros 149) |  May 14, 2162 (Saros 150) |  April 12, 2173 (Saros 151) |
 March 12, 2184 (Saros 152) |  February 10, 2195 (Saros 153) | |||
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 | ||
|---|---|---|
 June 16, 1825 (Saros 134) |  May 26, 1854 (Saros 135) |  May 6, 1883 (Saros 136) |
 April 17, 1912 (Saros 137) |  March 27, 1941 (Saros 138) |  March 7, 1970 (Saros 139) |
 February 16, 1999 (Saros 140) |  January 26, 2028 (Saros 141) |  January 5, 2057 (Saros 142) |
December 16, 2085 (Saros 143) |  November 27, 2114 (Saros 144) |  November 7, 2143 (Saros 145) |
 October 17, 2172 (Saros 146) | ||
.jpg)
