Solar eclipse of June 21, 2001

A total solar eclipse occurred at the Moon's ascending node of orbit on Thursday, June 21, 2001,^[1] with a magnitude of 1.0495. It was the first solar eclipse of the 21st century. 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 total solar eclipse occurs when the Moon's apparent diameter is larger than the Sun's, blocking all direct sunlight, turning day into darkness. Totality occurs in a narrow path across Earth's surface, with the partial solar eclipse visible over a surrounding region thousands of kilometres wide. Occurring about 2.25 days before perigee (on June 23, 2001, at 18:20 UTC), the Moon's apparent diameter was larger.^[2]

Solar eclipse of June 21, 2001

Total eclipse
Totality from Lusaka, Zambia by the Williams College eclipse expedition
Map
Gamma	−0.5701
Magnitude	1.0495
Maximum eclipse
Duration	297 s (4 min 57 s)
Coordinates	11.3°S 2.7°E / -11.3; 2.7
Max. width of band	200 km (120 mi)
Times (UTC)
(P1) Partial begin	9:33:04
(U1) Total begin	10:35:59
Greatest eclipse	12:04:46
(U4) Total end	13:31:37
(P4) Partial end	14:35:25
References
Saros	127 (57 of 82)
Catalog # (SE5000)	9511
← December 25, 2000 December 14, 2001 →

Many people traveled to Africa to watch the eclipse;^[3][4][5] the Daily Telegraph reported that "while some tribesmen watch a celestial crocodile eating the sun, the modern African will be counting the cash brought in by thousands of visitors".^[6]

Visibility

It was visible from a narrow corridor in the southern Atlantic Ocean and southern Africa, including Angola, Zambia, Zimbabwe, Mozambique, the southern tip of Malawi, and Madagascar. A partial eclipse was seen from the much broader path of the Moon's penumbra, including eastern South America and most of Africa.

Observations

Within the path of totality, Angola got the best conditions with the highest solar zenith angle, longest duration and largest chance of clear weather. Sumbe, capital of Cuanza Sul Province, where the path first touched land, was the best in Angola with 4 minutes and 34 seconds of totality. However, the Angolan Civil War^[7] prevented many from traveling to the county, and only about 500 people observed the eclipse there. Besides tourists, there were also scientists from the United States, France, Brazil, South Africa, the Czech Republic, Portugal and Hungary.^[8]

Zambia, though inferior to its neighbouring country Angola in the chance of clear weather, attracted many scientists and tourists due to its stable political situation and also the fact that its capital city Lusaka was also located within the path of totality.^[7] The Zambian government made it a national holiday with one day off, and ZamPost also issues special postage stamps and first-day covers.^[9] Scientists from the United States, the United Kingdom, Germany, Japan, South Korea and China observed it in Zambia.^[9] The Chinese Academy of Sciences sent a team of 6 people, carrying 3 gravimeters, 2 nuclear gyromagnetometers, 4 digital acquisition systems and recording systems to study the gravity anomalies recorded by Indian scientists during the total solar eclipse of October 24, 1995, and by Chinese scientists during the total solar eclipse of March 9, 1997, in Mohe County.^[10][11] With continuous observation for more than 10 years after that, China obtained the first observational evidence that the gravity field propagates at the speed of light.^[12]

Coincidence

Besides the eclipse, the day was also the June solstice (winter solstice in the Southern Hemisphere where the path of totality passed) when the sun was at the northernmost limit. It was also the closest approach of Mars since 1988.^[13]

Images

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.^[14]

June 21, 2001 Solar Eclipse Times

Event	Time (UTC)
First Penumbral External Contact	2001 June 21 at 09:34:04.6 UTC
First Umbral External Contact	2001 June 21 at 10:37:00.4 UTC
First Central Line	2001 June 21 at 10:38:10.0 UTC
First Umbral Internal Contact	2001 June 21 at 10:39:19.9 UTC
Ecliptic Conjunction	2001 June 21 at 11:58:49.4 UTC
Equatorial Conjunction	2001 June 21 at 11:58:54.2 UTC
Greatest Eclipse	2001 June 21 at 12:04:46.3 UTC
Greatest Duration	2001 June 21 at 12:07:11.5 UTC
Last Umbral Internal Contact	2001 June 21 at 13:30:14.3 UTC
Last Central Line	2001 June 21 at 13:31:26.2 UTC
Last Umbral External Contact	2001 June 21 at 13:32:37.9 UTC
Last Penumbral External Contact	2001 June 21 at 14:35:26.2 UTC

June 21, 2001 Solar Eclipse Parameters

Parameter	Value
Eclipse Magnitude	1.04954
Eclipse Obscuration	1.10153
Gamma	−0.57013
Sun Right Ascension	06h00m46.1s
Sun Declination	+23°26'18.2"
Sun Semi-Diameter	15'44.3"
Sun Equatorial Horizontal Parallax	08.7"
Moon Right Ascension	06h01m00.5s
Moon Declination	+22°52'27.2"
Moon Semi-Diameter	16'17.6"
Moon Equatorial Horizontal Parallax	0°59'47.9"
ΔT	64.2 s

Eclipse season

See also: Eclipse cycle

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 June–July 2001

June 21 Ascending node (new moon)	July 5 Descending node (full moon)
Total solar eclipse Solar Saros 127	Partial lunar eclipse Lunar Saros 139

Related eclipses

Eclipses in 2001

• A total lunar eclipse on January 9.
• A total solar eclipse on June 21.
• A partial lunar eclipse on July 5.
• An annular solar eclipse on December 14.
• A penumbral lunar eclipse on December 30.

Metonic

• Preceded by: Solar eclipse of September 2, 1997
• Followed by: Solar eclipse of April 8, 2005

Tzolkinex

• Preceded by: Solar eclipse of May 10, 1994
• Followed by: Solar eclipse of August 1, 2008

Half-Saros

• Preceded by: Lunar eclipse of June 15, 1992
• Followed by: Lunar eclipse of June 26, 2010

Tritos

• Preceded by: Solar eclipse of July 22, 1990
• Followed by: Solar eclipse of May 20, 2012

Solar Saros 127

• Preceded by: Solar eclipse of June 11, 1983
• Followed by: Solar eclipse of July 2, 2019

Inex

• Preceded by: Solar eclipse of July 10, 1972
• Followed by: Solar eclipse of June 1, 2030

Triad

• Preceded by: Solar eclipse of August 21, 1914
• Followed by: Solar eclipse of April 21, 2088

Solar eclipses of 2000–2003

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.^[15]

The partial solar eclipses on February 5, 2000 and July 31, 2000 occur in the previous lunar year eclipse set.

Solar eclipse series sets from 2000 to 2003
Ascending node				Descending node
Saros	Map	Gamma		Saros	Map	Gamma
117	July 1, 2000 Partial	−1.28214		122 Partial projection in Minneapolis, MN, USA	December 25, 2000 Partial	1.13669
127 Totality in Lusaka, Zambia	June 21, 2001 Total	−0.57013		132 Partial in Minneapolis, MN, USA	December 14, 2001 Annular	0.40885
137 Partial in Los Angeles, CA, USA	June 10, 2002 Annular	0.19933		142 Totality in Woomera, South Australia	December 4, 2002 Total	−0.30204
147 Annularity in Culloden, Scotland	May 31, 2003 Annular	0.99598		152	November 23, 2003 Total	−0.96381

Saros 127

This eclipse is a part of Saros series 127, repeating every 18 years, 11 days, and containing 82 events. The series started with a partial solar eclipse on October 10, 991 AD. It contains total eclipses from May 14, 1352 through August 15, 2091. There are no annular or hybrid eclipses in this set. The series ends at member 82 as a partial eclipse on March 21, 2452. 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 totality was produced by member 31 at 5 minutes, 40 seconds on August 30, 1532. All eclipses in this series occur at the Moon’s ascending node of orbit.^[16]

Series members 46–68 occur between 1801 and 2200:
46	47	48
February 21, 1803	March 4, 1821	March 15, 1839
49	50	51
March 25, 1857	April 6, 1875	April 16, 1893
52	53	54
April 28, 1911	May 9, 1929	May 20, 1947
55	56	57
May 30, 1965	June 11, 1983	June 21, 2001
58	59	60
July 2, 2019	July 13, 2037	July 24, 2055
61	62	63
August 3, 2073	August 15, 2091	August 26, 2109
64	65	66
September 6, 2127	September 16, 2145	September 28, 2163
67	68
October 8, 2181	October 19, 2199

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 ascending node.

21 eclipse events between June 21, 1982 and June 21, 2058
June 21	April 8–9	January 26	November 13–14	September 1–2
117	119	121	123	125
June 21, 1982	April 9, 1986	January 26, 1990	November 13, 1993	September 2, 1997
127	129	131	133	135
June 21, 2001	April 8, 2005	January 26, 2009	November 13, 2012	September 1, 2016
137	139	141	143	145
June 21, 2020	April 8, 2024	January 26, 2028	November 14, 2031	September 2, 2035
147	149	151	153	155
June 21, 2039	April 9, 2043	January 26, 2047	November 14, 2050	September 2, 2054
157
June 21, 2058

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
January 1, 1805 (Saros 109)		October 31, 1826 (Saros 111)		August 28, 1848 (Saros 113)
July 29, 1859 (Saros 114)	June 28, 1870 (Saros 115)	May 27, 1881 (Saros 116)	April 26, 1892 (Saros 117)	March 29, 1903 (Saros 118)
February 25, 1914 (Saros 119)	January 24, 1925 (Saros 120)	December 25, 1935 (Saros 121)	November 23, 1946 (Saros 122)	October 23, 1957 (Saros 123)
September 22, 1968 (Saros 124)	August 22, 1979 (Saros 125)	July 22, 1990 (Saros 126)	June 21, 2001 (Saros 127)	May 20, 2012 (Saros 128)
April 20, 2023 (Saros 129)	March 20, 2034 (Saros 130)	February 16, 2045 (Saros 131)	January 16, 2056 (Saros 132)	December 17, 2066 (Saros 133)
November 15, 2077 (Saros 134)	October 14, 2088 (Saros 135)	September 14, 2099 (Saros 136)	August 15, 2110 (Saros 137)	July 14, 2121 (Saros 138)
June 13, 2132 (Saros 139)	May 14, 2143 (Saros 140)	April 12, 2154 (Saros 141)	March 12, 2165 (Saros 142)	February 10, 2176 (Saros 143)
January 9, 2187 (Saros 144)	December 9, 2197 (Saros 145)

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
October 20, 1827 (Saros 121)	September 29, 1856 (Saros 122)	September 8, 1885 (Saros 123)
August 21, 1914 (Saros 124)	August 1, 1943 (Saros 125)	July 10, 1972 (Saros 126)
June 21, 2001 (Saros 127)	June 1, 2030 (Saros 128)	May 11, 2059 (Saros 129)
April 21, 2088 (Saros 130)	April 2, 2117 (Saros 131)	March 12, 2146 (Saros 132)
February 21, 2175 (Saros 133)