# Solar eclipse of December 16, 2085

An annular solar eclipse will occur at the Moon's ascending node of orbit between Sunday, December 16 and Monday, December 17, 2085, with a magnitude of 0.9971. 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 3.7 days before perigee (on December 20, 2085, at 14:40 UTC), the Moon's apparent diameter will be larger.
The path of annularity will be visible from parts of Micronesia and southwestern Mexico. A partial solar eclipse will also be visible for parts of northern Australia, Oceania, Hawaii, and western North America.

## Eclipse details

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.
December 16, 2085 Solar Eclipse Times :
| 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 |
December 16, 2085 Solar Eclipse Parameters :
| 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 |

## Eclipse season

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 December 2085 :
| December 1 Descending node (full moon) | December 16 Ascending node (new moon) |
| Penumbral lunar eclipse Lunar Saros 117 | Annular solar eclipse Solar Saros 143 |

## Related eclipses
### Eclipses in 2085

* A penumbral lunar eclipse on January 10.
* A penumbral lunar eclipse on June 8.
* An annular solar eclipse on June 22.
* A penumbral lunar eclipse on July 7.
* A penumbral lunar eclipse on December 1.
* An annular solar eclipse on December 16.

### Metonic

* Preceded by: Solar eclipse of February 27, 2082
* Followed by: Solar eclipse of October 4, 2089

### Tzolkinex

* Preceded by: Solar eclipse of November 4, 2078
* Followed by: Solar eclipse of January 27, 2093

### Half-Saros

* Preceded by: Lunar eclipse of December 10, 2076
* Followed by: Lunar eclipse of December 21, 2094

### Tritos

* Preceded by: Solar eclipse of January 16, 2075
* Followed by: Solar eclipse of November 15, 2096

### Solar Saros 143

* Preceded by: Solar eclipse of December 6, 2067
* Followed by: Solar eclipse of December 29, 2103

### Inex

* Preceded by: Solar eclipse of January 5, 2057
* Followed by: Solar eclipse of November 27, 2114

### Triad

* Preceded by: Solar eclipse of February 16, 1999
* Followed by: Solar eclipse of October 17, 2172

### Solar eclipses of 2083–2087

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.
The partial solar eclipses on February 16, 2083 and August 13, 2083 occur in the previous lunar year eclipse set, and the partial solar eclipses on May 2, 2087 and October 26, 2087 occur in the next lunar year eclipse set.
Solar eclipse series sets from 2083 to 2087 :
| Descending node | Descending node | Descending node | Ascending node | Ascending 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 |

### Saros 143

This eclipse is a part of Saros 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 through October 24, 1995; hybrid eclipses from November 3, 2013 through December 6, 2067; and annular eclipses from December 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 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 16 at 3 minutes, 50 seconds on August 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’s ascending node of orbit.
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 |

### 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 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 |

### 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 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) |

### 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 :
| 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) | | |