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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

Tritos series

The tritos series repeats 31 days short of 11 years at alternating nodes. Sequential events have incremental Saros cycle indices.

This series produces 20 total eclipses between April 24, 1967 and August 11, 2185, only being partial on November 19, 2021.

Tritos eclipse series (subset 1901–2087)
Descending node			Ascending node
Saros	Date Viewing	Type chart	Saros	Date Viewing	Type chart
115	1901 Oct 27	Partial	116	1912 Sep 26	Partial
117	1923 Aug 26	Partial	118	1934 Jul 26	Partial
119	1945 Jun 25	Partial	120	1956 May 24	Partial
121	1967 Apr 24	Total	122	1978 Mar 24	Total
123	1989 Feb 20	Total	124	2000 Jan 21	Total
125	2010 Dec 21	Total	126	2021 Nov 19	Partial
127	2032 Oct 18	Total	128	2043 Sep 19	Total
129	2054 Aug 18	Total	130	2065 Jul 17	Total
131	2076 Jun 17	Total	132	2087 May 17	Total
133	2098 Apr 15	Total

Half-Saros cycle

A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half-saros).^[6] This lunar eclipse is related to two annular solar eclipses of Solar Saros 131.