# May 1958 lunar eclipse

A partial lunar eclipse occurred at the Moon’s ascending node of orbit on Saturday, May 3, 1958, with an umbral magnitude of 0.0092. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A partial lunar eclipse occurs when one part of the Moon is in the Earth's umbra, while the other part is in 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 1.2 days after perigee (on May 2, 1958, at 7:00 UTC), the Moon's apparent diameter was larger.

## Visibility

The eclipse was completely visible over northeast Asia, Australia, and Antarctica, seen rising over east, southeast, and south Asia and setting over much of North America and western South America.

## Eclipse details

Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.
May 3, 1958 Lunar Eclipse Parameters :
| Parameter | Value |
| Penumbral Magnitude | 0.96760 |
| Umbral Magnitude | 0.00919 |
| Gamma | 1.01884 |
| Sun Right Ascension | 02h40m25.8s |
| Sun Declination | +15°36'27.0" |
| Sun Semi-Diameter | 15'51.8" |
| Sun Equatorial Horizontal Parallax | 08.7" |
| Moon Right Ascension | 14h41m19.7s |
| Moon Declination | -14°35'56.8" |
| Moon Semi-Diameter | 16'33.1" |
| Moon Equatorial Horizontal Parallax | 1°00'44.9" |
| ΔT | 32.4 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. The first and last eclipse in this sequence is separated by one synodic month.
Eclipse season of April–May 1958 :
| April 4 Ascending node (full moon) | April 19 Descending node (new moon) | May 3 Ascending node (full moon) |
| Penumbral lunar eclipse Lunar Saros 102 | Annular solar eclipse Solar Saros 128 | Partial lunar eclipse Lunar Saros 140 |

## Related eclipses
### Eclipses in 1958

* A penumbral lunar eclipse on April 4.
* An annular solar eclipse on April 19.
* A partial lunar eclipse on May 3.
* A total solar eclipse on October 12.
* A penumbral lunar eclipse on October 27.

### Metonic

* Preceded by: Lunar eclipse of July 16, 1954
* Followed by: Lunar eclipse of February 19, 1962

### Tzolkinex

* Preceded by: Lunar eclipse of March 23, 1951
* Followed by: Lunar eclipse of June 14, 1965

### Half-Saros

* Preceded by: Solar eclipse of April 28, 1949
* Followed by: Solar eclipse of May 9, 1967

### Tritos

* Preceded by: Lunar eclipse of June 3, 1947
* Followed by: Lunar eclipse of April 2, 1969

### Lunar Saros 140

* Preceded by: Lunar eclipse of April 22, 1940
* Followed by: Lunar eclipse of May 13, 1976

### Inex

* Preceded by: Lunar eclipse of May 23, 1929
* Followed by: Lunar eclipse of April 14, 1987

### Triad

* Preceded by: Lunar eclipse of July 2, 1871
* Followed by: Lunar eclipse of March 3, 2045

### Lunar eclipses of 1955–1958

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 eclipse on January 8, 1955 occurs in the previous lunar year eclipse set, and the penumbral lunar eclipse on April 4, 1958 occurs in the next lunar year eclipse set.
Lunar eclipse series sets from 1955 to 1958 :
| Ascending node | Ascending node | Ascending node | Ascending node | Descending node | Descending node | Descending node | Descending node |
| Saros | Date Viewing | Type Chart | Gamma | Saros | Date Viewing | Type Chart | Gamma |
| 110 | 1955 Jun 05 | Penumbral | −1.2384 | 115 | 1955 Nov 29 | Partial | 0.9551 |
| 120 | 1956 May 24 | Partial | −0.4726 | 125 | 1956 Nov 18 | Total | 0.2917 |
| 130 | 1957 May 13 | Total | 0.3046 | 135 | 1957 Nov 07 | Total | −0.4332 |
| 140 | 1958 May 03 | Partial | 1.0188 | 145 | 1958 Oct 27 | Penumbral | −1.1571 |

### Saros 140

This eclipse is a part of Saros series 140, repeating every 18 years, 11 days, and containing 77 events. The series started with a penumbral lunar eclipse on September 25, 1597. It contains partial eclipses from May 3, 1958 through July 17, 2084; total eclipses from July 30, 2102 through May 21, 2589; and a second set of partial eclipses from June 2, 2607 through August 7, 2715. The series ends at member 77 as a penumbral eclipse on January 6, 2968.
The longest duration of totality will be produced by member 38 at 98 minutes, 36 seconds on November 4, 2264. 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 will occur on 2264 Nov 04, lasting 98 minutes, 36 seconds. | Penumbral | Partial | Total | Central |
| The greatest eclipse of the series will occur on 2264 Nov 04, lasting 98 minutes, 36 seconds. | 1597 Sep 25 | 1958 May 03 | 2102 Jul 30 | 2156 Aug 30 |
| Last ||||
| The greatest eclipse of the series will occur on 2264 Nov 04, lasting 98 minutes, 36 seconds. | Central | Total | Partial | Penumbral |
| The greatest eclipse of the series will occur on 2264 Nov 04, lasting 98 minutes, 36 seconds. | 2535 Apr 19 | 2589 May 21 | 2715 Aug 07 | 2968 Jan 06 |
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 13–34 occur between 1801 and 2200: :
| 13 | 13 | 14 | 14 | 15 | 15 |
| 1814 Feb 04 | 1814 Feb 04 | 1832 Feb 16 | 1832 Feb 16 | 1850 Feb 26 | 1850 Feb 26 |
| 16 | 16 | 17 | 17 | 18 | 18 |
| 1868 Mar 08 | 1868 Mar 08 | 1886 Mar 20 | 1886 Mar 20 | 1904 Mar 31 | 1904 Mar 31 |
| 19 | 19 | 20 | 20 | 21 | 21 |
| 1922 Apr 11 | 1922 Apr 11 | 1940 Apr 22 | 1940 Apr 22 | 1958 May 03 | 1958 May 03 |
| 22 | 22 | 23 | 23 | 24 | 24 |
| 1976 May 13 | 1976 May 13 | 1994 May 25 | 1994 May 25 | 2012 Jun 04 | 2012 Jun 04 |
| 25 | 25 | 26 | 26 | 27 | 27 |
| 2030 Jun 15 | 2030 Jun 15 | 2048 Jun 26 | 2048 Jun 26 | 2066 Jul 07 | 2066 Jul 07 |
| 28 | 28 | 29 | 29 | 30 | 30 |
| 2084 Jul 17 | 2084 Jul 17 | 2102 Jul 30 | 2102 Jul 30 | 2120 Aug 09 | 2120 Aug 09 |
| 31 | 31 | 32 | 32 | 33 | 33 |
| 2138 Aug 20 | 2138 Aug 20 | 2156 Aug 30 | 2156 Aug 30 | 2174 Sep 11 | 2174 Sep 11 |
| 34 ||
| 2192 Sep 21 ||

### 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 2132 :
| 1805 Jul 11 (Saros 126) | 1805 Jul 11 (Saros 126) | 1816 Jun 10 (Saros 127) | 1816 Jun 10 (Saros 127) | 1827 May 11 (Saros 128) | 1827 May 11 (Saros 128) | 1838 Apr 10 (Saros 129) | 1838 Apr 10 (Saros 129) | 1849 Mar 09 (Saros 130) | 1849 Mar 09 (Saros 130) |
| 1860 Feb 07 (Saros 131) | 1860 Feb 07 (Saros 131) | 1871 Jan 06 (Saros 132) | 1871 Jan 06 (Saros 132) | 1881 Dec 05 (Saros 133) | 1881 Dec 05 (Saros 133) | 1892 Nov 04 (Saros 134) | 1892 Nov 04 (Saros 134) | 1903 Oct 06 (Saros 135) | 1903 Oct 06 (Saros 135) |
| 1914 Sep 04 (Saros 136) | 1914 Sep 04 (Saros 136) | 1925 Aug 04 (Saros 137) | 1925 Aug 04 (Saros 137) | 1936 Jul 04 (Saros 138) | 1936 Jul 04 (Saros 138) | 1947 Jun 03 (Saros 139) | 1947 Jun 03 (Saros 139) | 1958 May 03 (Saros 140) | 1958 May 03 (Saros 140) |
| 1969 Apr 02 (Saros 141) | 1969 Apr 02 (Saros 141) | 1980 Mar 01 (Saros 142) | 1980 Mar 01 (Saros 142) | 1991 Jan 30 (Saros 143) | 1991 Jan 30 (Saros 143) | 2001 Dec 30 (Saros 144) | 2001 Dec 30 (Saros 144) | 2012 Nov 28 (Saros 145) | 2012 Nov 28 (Saros 145) |
| 2023 Oct 28 (Saros 146) | 2023 Oct 28 (Saros 146) | 2034 Sep 28 (Saros 147) | 2034 Sep 28 (Saros 147) | 2045 Aug 27 (Saros 148) | 2045 Aug 27 (Saros 148) | 2056 Jul 26 (Saros 149) | 2056 Jul 26 (Saros 149) | 2067 Jun 27 (Saros 150) | 2067 Jun 27 (Saros 150) |
| 2132 Dec 22 (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 :
| 1813 Aug 12 (Saros 135) | 1813 Aug 12 (Saros 135) | 1842 Jul 22 (Saros 136) | 1842 Jul 22 (Saros 136) | 1871 Jul 02 (Saros 137) | 1871 Jul 02 (Saros 137) |
| 1900 Jun 13 (Saros 138) | 1900 Jun 13 (Saros 138) | 1929 May 23 (Saros 139) | 1929 May 23 (Saros 139) | 1958 May 03 (Saros 140) | 1958 May 03 (Saros 140) |
| 1987 Apr 14 (Saros 141) | 1987 Apr 14 (Saros 141) | 2016 Mar 23 (Saros 142) | 2016 Mar 23 (Saros 142) | 2045 Mar 03 (Saros 143) | 2045 Mar 03 (Saros 143) |
| 2074 Feb 11 (Saros 144) | 2074 Feb 11 (Saros 144) | 2103 Jan 23 (Saros 145) | 2103 Jan 23 (Saros 145) | 2132 Jan 02 (Saros 146) | 2132 Jan 02 (Saros 146) |
| 2160 Dec 13 (Saros 147) | 2160 Dec 13 (Saros 147) | 2189 Nov 22 (Saros 148) | 2189 Nov 22 (Saros 148) |

### 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 partial solar eclipses of Solar Saros 147.
| April 28, 1949 | May 9, 1967 |