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January 2000 lunar eclipse
Total eclipse
	Partial from Buenos Aires, 3:20 UTC
Date	January 21, 2000
Gamma	−0.2957
Magnitude	1.3246
Saros cycle	124 (48 of 74)
Totality	76 minutes, 59 seconds
Partiality	203 minutes, 19 seconds
Penumbral	318 minutes, 12 seconds
P1
Contacts (UTC)
P1	02:04:26
U1	03:01:50
U2	04:05:01
Greatest	04:43:31
U3	05:22:00
U4	06:25:09
P4	07:22:38
	← July 1999 July 2000 →

A total lunar eclipse occurred at the Moon’s ascending node of orbit on Friday, January 21, 2000,^[1] with an umbral magnitude of 1.3246. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. A total lunar eclipse occurs when the Moon's near side entirely passes into the Earth's umbral shadow. 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. A total lunar eclipse can last up to nearly two hours, while a total solar eclipse lasts only a few minutes at any given place, because the Moon's shadow is smaller. Occurring about 1.5 days after perigee (on January 19, 2000, at 17:50 UTC), the Moon's apparent diameter was larger.^[2]

Visibility

The eclipse was completely visible over most of North America, South America, and western Europe, seen rising over the Pacific Ocean and setting over Africa, Europe, and west Asia.^[3]

	Hourly motion shown right to left

Eclipse details

Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.^[4]

January 21, 2000 Lunar Eclipse Parameters
Parameter	Value
Penumbral Magnitude	2.30601
Umbral Magnitude	1.32459
Gamma	−0.29571
Sun Right Ascension	20h10m32.9s
Sun Declination	-20°03'20.2"
Sun Semi-Diameter	16'15.2"
Sun Equatorial Horizontal Parallax	08.9"
Moon Right Ascension	08h10m24.0s
Moon Declination	+19°45'29.3"
Moon Semi-Diameter	16'33.7"
Moon Equatorial Horizontal Parallax	1°00'46.8"
ΔT	63.8 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 2000
January 21 Ascending node (full moon)	February 5 Descending node (new moon)

Total lunar eclipse Lunar Saros 124	Partial solar eclipse Solar Saros 150

Related eclipses

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.^[5]

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				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 124

This eclipse is a part of Saros series 124, repeating every 18 years, 11 days, and containing 73 events. The series started with a penumbral lunar eclipse on August 17, 1152. It contains partial eclipses from March 21, 1513 through June 15, 1639; total eclipses from June 25, 1657 through April 18, 2144; and a second set of partial eclipses from April 29, 2162 through July 14, 2288. The series ends at member 73 as a penumbral eclipse on October 21, 2450.

The longest duration of totality was produced by member 39 at 101 minutes, 27 seconds on August 30, 1765. All eclipses in this series occur at the Moon’s ascending node of orbit.^[6]

Greatest	First
The greatest eclipse of the series occurred on 1765 Aug 30, lasting 101 minutes, 27 seconds.^[7]	Penumbral	Partial	Total	Central
	1152 Aug 17	1513 Mar 21	1657 Jun 25	1711 Jul 29
	Last
	Central	Total	Partial	Penumbral
	1909 Nov 27	2144 Apr 18	2288 Jul 14	2450 Oct 21

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 37–59 occur between 1801 and 2200:
37	38	39
1801 Sep 22	1819 Oct 03	1837 Oct 13

40	41	42
1855 Oct 25	1873 Nov 04	1891 Nov 16

43	44	45
1909 Nov 27	1927 Dec 08	1945 Dec 19

46	47	48
1963 Dec 30	1982 Jan 09	2000 Jan 21

49	50	51
2018 Jan 31	2036 Feb 11	2054 Feb 22

52	53	54
2072 Mar 04	2090 Mar 15	2108 Mar 27

55	56	57
2126 Apr 07	2144 Apr 18	2162 Apr 29

58	59
2180 May 09	2198 May 20

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
1803 Aug 03 (Saros 106)	1814 Jul 02 (Saros 107)	1825 Jun 01 (Saros 108)	1836 May 01 (Saros 109)	1847 Mar 31 (Saros 110)

1858 Feb 27 (Saros 111)	1869 Jan 28 (Saros 112)	1879 Dec 28 (Saros 113)	1890 Nov 26 (Saros 114)	1901 Oct 27 (Saros 115)

1912 Sep 26 (Saros 116)	1923 Aug 26 (Saros 117)	1934 Jul 26 (Saros 118)	1945 Jun 25 (Saros 119)	1956 May 24 (Saros 120)

1967 Apr 24 (Saros 121)	1978 Mar 24 (Saros 122)	1989 Feb 20 (Saros 123)	2000 Jan 21 (Saros 124)	2010 Dec 21 (Saros 125)

2021 Nov 19 (Saros 126)	2032 Oct 18 (Saros 127)	2043 Sep 19 (Saros 128)	2054 Aug 18 (Saros 129)	2065 Jul 17 (Saros 130)

2076 Jun 17 (Saros 131)	2087 May 17 (Saros 132)	2098 Apr 15 (Saros 133)	2109 Mar 17 (Saros 134)	2120 Feb 14 (Saros 135)

2131 Jan 13 (Saros 136)	2141 Dec 13 (Saros 137)	2152 Nov 12 (Saros 138)	2163 Oct 12 (Saros 139)	2174 Sep 11 (Saros 140)

2185 Aug 11 (Saros 141)	2196 Jul 10 (Saros 142)

Half-Saros cycle

A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half-saros).^[8] This lunar eclipse is related to two annular solar eclipses of Solar Saros 131.