# Solar eclipse of August 31, 1989

A partial solar eclipse occurred at the Moon's descending node of orbit on Thursday, August 31, 1989, with a magnitude of 0.6344. 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 Antarctica.

## 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.
August 31, 1989 Solar Eclipse Times :
| Event | Time (UTC) |
| First Penumbral External Contact | 1989 August 31 at 03:34:34.1 UTC |
| Greatest Eclipse | 1989 August 31 at 05:31:46.6 UTC |
| Ecliptic Conjunction | 1989 August 31 at 05:45:27.9 UTC |
| Equatorial Conjunction | 1989 August 31 at 06:44:00.9 UTC |
| Last Penumbral External Contact | 1989 August 31 at 07:28:34.9 UTC |
August 31, 1989 Solar Eclipse Parameters :
| Parameter | Value |
| Eclipse Magnitude | 0.63443 |
| Eclipse Obscuration | 0.53492 |
| Gamma | −1.19279 |
| Sun Right Ascension | 10h37m52.8s |
| Sun Declination | +08°38'48.2" |
| Sun Semi-Diameter | 15'50.7" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 10h35m50.9s |
| Moon Declination | +07°40'48.2" |
| Moon Semi-Diameter | 14'58.4" |
| Moon Equatorial Horizontal Parallax | 0°54'57.0" |
| ΔT | 56.7 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 August 1989 :
| August 17 Ascending node (full moon) | August 31 Descending node (new moon) |
| Total lunar eclipse Lunar Saros 128 | Partial solar eclipse Solar Saros 154 |

## Related eclipses
### Eclipses in 1989

* A total lunar eclipse on February 20.
* A partial solar eclipse on March 7.
* A total lunar eclipse on August 17.
* A partial solar eclipse on August 31.

### Metonic

* Preceded by: Solar eclipse of November 12, 1985

### Tzolkinex

* Preceded by: Solar eclipse of July 20, 1982
* Followed by: Solar eclipse of October 12, 1996

### Half-Saros

* Preceded by: Lunar eclipse of August 26, 1980
* Followed by: Lunar eclipse of September 6, 1998

### Tritos

* Preceded by: Solar eclipse of October 2, 1978
* Followed by: Solar eclipse of July 31, 2000

### Solar Saros 154

* Preceded by: Solar eclipse of August 20, 1971
* Followed by: Solar eclipse of September 11, 2007

### Inex

* Preceded by: Solar eclipse of September 20, 1960
* Followed by: Solar eclipse of August 11, 2018

### Triad

* Preceded by: Solar eclipse of October 31, 1902
* Followed by: Solar eclipse of July 1, 2076

### Solar eclipses of 1986–1989

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.
Solar eclipse series sets from 1986 to 1989 :
| Ascending node | Ascending node | Ascending node | Descending node | Descending node | Descending node |
| Saros | Map | Gamma | Saros | Map | Gamma |
| 119 | April 9, 1986 Partial | −1.0822 | 124 | October 3, 1986 Hybrid | 0.9931 |
| 129 | March 29, 1987 Hybrid | −0.3053 | 134 | September 23, 1987 Annular | 0.2787 |
| 139 | March 18, 1988 Total | 0.4188 | 144 | September 11, 1988 Annular | −0.4681 |
| 149 | March 7, 1989 Partial | 1.0981 | 154 | August 31, 1989 Partial | −1.1928 |

### Saros 154

This eclipse is a part of Saros series 154, repeating every 18 years, 11 days, and containing 71 events. The series started with a partial solar eclipse on July 19, 1917. It contains annular eclipses from October 3, 2043 through March 27, 2332; hybrid eclipses from April 7, 2350 through April 29, 2386; and total eclipses from May 9, 2404 through May 29, 3035. The series ends at member 71 as a partial eclipse on August 25, 3179. 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 will be produced by member 9 at 3 minutes, 41 seconds on October 13, 2061, and the longest duration of totality will be produced by member 35 at 4 minutes, 50 seconds on July 25, 2530. All eclipses in this series occur at the Moon’s descending node of orbit.
Series members 1–16 occur between 1917 and 2200: :
| 1 | 2 | 3 |
| July 19, 1917 | July 30, 1935 | August 9, 1953 |
| 4 | 5 | 6 |
| August 20, 1971 | August 31, 1989 | September 11, 2007 |
| 7 | 8 | 9 |
| September 21, 2025 | October 3, 2043 | October 13, 2061 |
| 10 | 11 | 12 |
| October 24, 2079 | November 4, 2097 | November 16, 2115 |
| 13 | 14 | 15 |
| November 26, 2133 | December 8, 2151 | December 18, 2169 |
| 16 |
| December 29, 2187 |

### 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 descending node.
22 eclipse events between April 8, 1902 and August 31, 1989 :
| April 7–8 | January 24–25 | November 12 | August 31–September 1 | June 19–20 |
| 108 | 110 | 112 | 114 | 116 |
| April 8, 1902 | | | August 31, 1913 | June 19, 1917 |
| 118 | 120 | 122 | 124 | 126 |
| April 8, 1921 | January 24, 1925 | November 12, 1928 | August 31, 1932 | June 19, 1936 |
| 128 | 130 | 132 | 134 | 136 |
| April 7, 1940 | January 25, 1944 | November 12, 1947 | September 1, 1951 | June 20, 1955 |
| 138 | 140 | 142 | 144 | 146 |
| April 8, 1959 | January 25, 1963 | November 12, 1966 | August 31, 1970 | June 20, 1974 |
| 148 | 150 | 152 | 154 |
| April 7, 1978 | January 25, 1982 | November 12, 1985 | August 31, 1989 |

### 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.
The partial solar eclipse on October 24, 2098 (part of Saros 164) is also a part of this series but is not included in the table below.
Series members between 1801 and 2011 :
| February 11, 1804 (Saros 137) | January 10, 1815 (Saros 138) | December 9, 1825 (Saros 139) | November 9, 1836 (Saros 140) | October 9, 1847 (Saros 141) |
| September 7, 1858 (Saros 142) | August 7, 1869 (Saros 143) | July 7, 1880 (Saros 144) | June 6, 1891 (Saros 145) | May 7, 1902 (Saros 146) |
| April 6, 1913 (Saros 147) | March 5, 1924 (Saros 148) | February 3, 1935 (Saros 149) | January 3, 1946 (Saros 150) | December 2, 1956 (Saros 151) |
| November 2, 1967 (Saros 152) | October 2, 1978 (Saros 153) | August 31, 1989 (Saros 154) | July 31, 2000 (Saros 155) | July 1, 2011 (Saros 156) |

### 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 :
| December 30, 1815 (Saros 148) | December 9, 1844 (Saros 149) | November 20, 1873 (Saros 150) |
| October 31, 1902 (Saros 151) | October 11, 1931 (Saros 152) | September 20, 1960 (Saros 153) |
| August 31, 1989 (Saros 154) | August 11, 2018 (Saros 155) | July 22, 2047 (Saros 156) |
| July 1, 2076 (Saros 157) | June 12, 2105 (Saros 158) | May 23, 2134 (Saros 159) |
| | April 12, 2192 (Saros 161) | |