Solar eclipse of September 22, 2006

• A penumbral lunar eclipse on March 14.
• A total solar eclipse on March 29.
• A partial lunar eclipse on September 7.
• An annular solar eclipse on September 22.

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.[1]

Solar eclipse series sets from 2004–2007
Ascending node				Descending node
Saros	Map	Gamma		Saros	Map	Gamma
119	2004 April 19 Partial (south)	-1.13345		124	2004 October 14 Partial (north)	1.03481
129 Partial from Naiguatá	2005 April 8 Hybrid	-0.34733		134 Annular from Madrid, Spain	2005 October 3 Annular	0.33058
139 Total from Side, Turkey	2006 March 29 Total	0.38433		144 Partial from São Paulo, Brazil	2006 September 22 Annular	-0.40624
149 From Jaipur, India	2007 March 19 Partial (north)	1.07277		154 From Córdoba, Argentina	2007 September 11 Partial (south)	-1.12552

It is a part of Saros cycle 144, repeating every 18 years, 11 days, containing 70 events. The series started with partial solar eclipse on April 11, 1736. It contains annular eclipses from July 7, 1880 through August 27, 2565. There are no total eclipses in the series. The series ends at member 70 as a partial eclipse on May 5, 2980. The longest duration of annularity will be 9 minutes, 52 seconds on December 29, 2168.

Series members 11–21 occur between 1901 and 2100:
11	12	13
Jul 30, 1916	Aug 10, 1934	Aug 20, 1952
14	15	16
Aug 31, 1970	Sep 11, 1988	Sep 22, 2006
17	18	19
Oct 2, 2024	Oct 14, 2042	Oct 24, 2060
20	21
Nov 4, 2078	Nov 15, 2096

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.

Inex series members between 1901 and 2100:
November 22, 1919 (Saros 141)	November 1, 1948 (Saros 142)	October 12, 1977 (Saros 143)
September 22, 2006 (Saros 144)	September 2, 2035 (Saros 145)	August 12, 2064 (Saros 146)
July 23, 2093 (Saros 147)

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 descending node.

21 eclipse events, progressing from north to south between July 11, 1953 and July 11, 2029
July 10–12	April 29–30	February 15–16	December 4–5	September 21–23
96	98	100	102	104
July 12, 1915	April 30, 1919	February 15, 1923	December 5, 1926	September 22, 1930
106	108	110	112	114
July 11, 1934	April 30, 1938	February 15, 1942	December 4, 1945	September 22, 1949
116	118	120	122	124
July 11, 1953	April 30, 1957	February 15, 1961	December 4, 1964	September 22, 1968
126	128	130	132	134
July 10, 1972	April 29, 1976	February 16, 1980	December 4, 1983	September 23, 1987
136	138	140	142	144
July 11, 1991	April 29, 1995	February 16, 1999	December 4, 2002	September 22, 2006
146	148	150	152	154
July 11, 2010	April 29, 2014	February 15, 2018	December 4, 2021	September 21, 2025
156	158	160	162	164
July 11, 2029	April 29, 2033	February 15, 2037	December 4, 2040	September 21, 2044