# January 1999 lunar eclipse

A penumbral lunar eclipse occurred at the Moon’s ascending node of orbit on Sunday, January 31, 1999, with an umbral magnitude of −0.0258. It was a relatively rare total penumbral lunar eclipse, with the Moon passing entirely within the penumbral shadow without entering the darker umbral shadow. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A penumbral lunar eclipse occurs when part or all of the Moon's near side passes into the Earth's penumbra. Unlike a solar eclipse, which can only be viewed from a relatively small area of the world, a lunar eclipse may be viewed from anywhere on the night side of Earth. Occurring about 4.8 days after perigee (on January 26, 1999, at 21:25 UTC), the Moon's apparent diameter was larger.

## Visibility

The eclipse was completely visible over Asia and Australia, seen rising over much of Africa, Europe, and the Middle East and setting over western North America and the central Pacific Ocean.

## Gallery

This simulated view compares this penumbral eclipse (left) to the full moon (right) as it appeared an hour before the eclipse.

## Eclipse details

Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.
January 31, 1999 Lunar Eclipse Parameters :
| Parameter | Value |
| Penumbral Magnitude | 1.00272 |
| Umbral Magnitude | −0.02583 |
| Gamma | −1.01898 |
| Sun Right Ascension | 20h55m10.7s |
| Sun Declination | -17°22'34.0" |
| Sun Semi-Diameter | 16'14.0" |
| Sun Equatorial Horizontal Parallax | 08.9" |
| Moon Right Ascension | 08h54m26.3s |
| Moon Declination | +16°24'30.3" |
| Moon Semi-Diameter | 15'47.0" |
| Moon Equatorial Horizontal Parallax | 0°57'55.6" |
| ΔT | 63.5 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 January–February 1999 :
| January 31 Ascending node (full moon) | February 16 Descending node (new moon) |
| Penumbral lunar eclipse Lunar Saros 114 | Annular solar eclipse Solar Saros 140 |

## Related eclipses
### Eclipses in 1999

* A penumbral lunar eclipse on January 31.
* An annular solar eclipse on February 16.
* A partial lunar eclipse on July 28.
* A total solar eclipse on August 11.

### Metonic

* Preceded by: Lunar eclipse of April 15, 1995
* Followed by: Lunar eclipse of November 20, 2002

### Tzolkinex

* Preceded by: Lunar eclipse of December 21, 1991
* Followed by: Lunar eclipse of March 14, 2006

### Half-Saros

* Preceded by: Solar eclipse of January 26, 1990
* Followed by: Solar eclipse of February 7, 2008

### Tritos

* Preceded by: Lunar eclipse of March 3, 1988
* Followed by: Lunar eclipse of December 31, 2009

### Lunar Saros 114

* Preceded by: Lunar eclipse of January 20, 1981
* Followed by: Lunar eclipse of February 11, 2017

### Inex

* Preceded by: Lunar eclipse of February 21, 1970
* Followed by: Lunar eclipse of January 12, 2028

### Triad

* Preceded by: Lunar eclipse of April 1, 1912
* Followed by: Lunar eclipse of December 1, 2085

### Lunar eclipses of 1998–2002

This eclipse is a member of a semester series. An eclipse in a semester series of lunar eclipses repeats approximately every 177 days and 4 hours (a semester) at alternating nodes of the Moon's orbit.
The penumbral lunar eclipses on March 13, 1998 and September 6, 1998 occur in the previous lunar year eclipse set, and the penumbral lunar eclipses on May 26, 2002 and November 20, 2002 occur in the next lunar year eclipse set.
Lunar eclipse series sets from 1998 to 2002 :
| Descending node | Descending node | Descending node | Descending node | Ascending node | Ascending node | Ascending node | Ascending node |
| Saros | Date Viewing | Type Chart | Gamma | Saros | Date Viewing | Type Chart | Gamma |
| 109 | 1998 Aug 08 | Penumbral | 1.4876 | 114 | 1999 Jan 31 | Penumbral | −1.0190 |
| 119 | 1999 Jul 28 | Partial | 0.7863 | 124 | 2000 Jan 21 | Total | −0.2957 |
| 129 | 2000 Jul 16 | Total | 0.0302 | 134 | 2001 Jan 09 | Total | 0.3720 |
| 139 | 2001 Jul 05 | Partial | −0.7287 | 144 | 2001 Dec 30 | Penumbral | 1.0732 |
| 149 | 2002 Jun 24 | Penumbral | −1.4440 |

### Saros 114

This eclipse is a part of Saros series 114, repeating every 18 years, 11 days, and containing 71 events. The series started with a penumbral lunar eclipse on May 13, 971 AD. It contains partial eclipses from August 7, 1115 through February 18, 1440; total eclipses from February 28, 1458 through July 17, 1674; and a second set of partial eclipses from July 28, 1692 through November 26, 1890. The series ends at member 71 as a penumbral eclipse on June 22, 2233.
The longest duration of totality was produced by member 35 at 106 minutes, 5 seconds on May 24, 1584. All eclipses in this series occur at the Moon’s ascending node of orbit.
| Greatest | First | First | First | First |
| The greatest eclipse of the series occurred on 1584 May 24, lasting 106 minutes, 5 seconds. | Penumbral | Partial | Total | Central |
| The greatest eclipse of the series occurred on 1584 May 24, lasting 106 minutes, 5 seconds. | 971 May 13 | 1115 Aug 07 | 1458 Feb 28 | 1530 Apr 12 |
| Last ||||
| The greatest eclipse of the series occurred on 1584 May 24, lasting 106 minutes, 5 seconds. | Central | Total | Partial | Penumbral |
| The greatest eclipse of the series occurred on 1584 May 24, lasting 106 minutes, 5 seconds. | 1638 Jun 26 | 1674 Jul 17 | 1890 Nov 26 | 2233 Jun 22 |
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.
Series members 48–69 occur between 1801 and 2200: :
| 48 | 48 | 49 | 49 | 50 | 50 |
| 1818 Oct 14 | 1818 Oct 14 | 1836 Oct 24 | 1836 Oct 24 | 1854 Nov 04 | 1854 Nov 04 |
| 51 | 51 | 52 | 52 | 53 | 53 |
| 1872 Nov 15 | 1872 Nov 15 | 1890 Nov 26 | 1890 Nov 26 | 1908 Dec 07 | 1908 Dec 07 |
| 54 | 54 | 55 | 55 | 56 | 56 |
| 1926 Dec 19 | 1926 Dec 19 | 1944 Dec 29 | 1944 Dec 29 | 1963 Jan 09 | 1963 Jan 09 |
| 57 | 57 | 58 | 58 | 59 | 59 |
| 1981 Jan 20 | 1981 Jan 20 | 1999 Jan 31 | 1999 Jan 31 | 2017 Feb 11 | 2017 Feb 11 |
| 60 | 60 | 61 | 61 | 62 | 62 |
| 2035 Feb 22 | 2035 Feb 22 | 2053 Mar 04 | 2053 Mar 04 | 2071 Mar 16 | 2071 Mar 16 |
| 63 | 63 | 64 | 64 | 65 | 65 |
| 2089 Mar 26 | 2089 Mar 26 | 2107 Apr 07 | 2107 Apr 07 | 2125 Apr 18 | 2125 Apr 18 |
| 66 | 66 | 67 | 67 | 68 | 68 |
| 2143 Apr 29 | 2143 Apr 29 | 2161 May 09 | 2161 May 09 | 2179 May 21 | 2179 May 21 |
| 69 ||
| 2197 May 31 ||

### 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 1835 and 2200 :
| 1835 May 12 (Saros 99) | 1835 May 12 (Saros 99) | 1846 Apr 11 (Saros 100) | 1846 Apr 11 (Saros 100) | | | 1868 Feb 08 (Saros 102) | 1868 Feb 08 (Saros 102) | 1879 Jan 08 (Saros 103) | 1879 Jan 08 (Saros 103) |
| | | | | | | | | 1933 Aug 05 (Saros 108) | 1933 Aug 05 (Saros 108) |
| 1944 Jul 06 (Saros 109) | 1944 Jul 06 (Saros 109) | 1955 Jun 05 (Saros 110) | 1955 Jun 05 (Saros 110) | 1966 May 04 (Saros 111) | 1966 May 04 (Saros 111) | 1977 Apr 04 (Saros 112) | 1977 Apr 04 (Saros 112) | 1988 Mar 03 (Saros 113) | 1988 Mar 03 (Saros 113) |
| 1999 Jan 31 (Saros 114) | 1999 Jan 31 (Saros 114) | 2009 Dec 31 (Saros 115) | 2009 Dec 31 (Saros 115) | 2020 Nov 30 (Saros 116) | 2020 Nov 30 (Saros 116) | 2031 Oct 30 (Saros 117) | 2031 Oct 30 (Saros 117) | 2042 Sep 29 (Saros 118) | 2042 Sep 29 (Saros 118) |
| 2053 Aug 29 (Saros 119) | 2053 Aug 29 (Saros 119) | 2064 Jul 28 (Saros 120) | 2064 Jul 28 (Saros 120) | 2075 Jun 28 (Saros 121) | 2075 Jun 28 (Saros 121) | 2086 May 28 (Saros 122) | 2086 May 28 (Saros 122) | 2097 Apr 26 (Saros 123) | 2097 Apr 26 (Saros 123) |
| 2108 Mar 27 (Saros 124) | 2108 Mar 27 (Saros 124) | 2119 Feb 25 (Saros 125) | 2119 Feb 25 (Saros 125) | 2130 Jan 24 (Saros 126) | 2130 Jan 24 (Saros 126) | 2140 Dec 23 (Saros 127) | 2140 Dec 23 (Saros 127) | 2151 Nov 24 (Saros 128) | 2151 Nov 24 (Saros 128) |
| 2162 Oct 23 (Saros 129) | 2162 Oct 23 (Saros 129) | 2173 Sep 21 (Saros 130) | 2173 Sep 21 (Saros 130) | 2184 Aug 21 (Saros 131) | 2184 Aug 21 (Saros 131) | 2195 Jul 22 (Saros 132) | 2195 Jul 22 (Saros 132) |

### 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 :
| 1825 Jun 01 (Saros 108) | 1825 Jun 01 (Saros 108) | 1854 May 12 (Saros 109) | 1854 May 12 (Saros 109) | 1883 Apr 22 (Saros 110) | 1883 Apr 22 (Saros 110) |
| 1912 Apr 01 (Saros 111) | 1912 Apr 01 (Saros 111) | 1941 Mar 13 (Saros 112) | 1941 Mar 13 (Saros 112) | 1970 Feb 21 (Saros 113) | 1970 Feb 21 (Saros 113) |
| 1999 Jan 31 (Saros 114) | 1999 Jan 31 (Saros 114) | 2028 Jan 12 (Saros 115) | 2028 Jan 12 (Saros 115) | 2056 Dec 22 (Saros 116) | 2056 Dec 22 (Saros 116) |
| 2085 Dec 01 (Saros 117) | 2085 Dec 01 (Saros 117) | 2114 Nov 12 (Saros 118) | 2114 Nov 12 (Saros 118) | 2143 Oct 23 (Saros 119) | 2143 Oct 23 (Saros 119) |
| 2172 Oct 02 (Saros 120) ||

### Half-Saros cycle

A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros). This lunar eclipse is related to two annular solar eclipses of Solar Saros 121.
| January 26, 1990 | February 7, 2008 |