A total solar eclipse occurred at the Moon's ascending node of orbit on Friday, April 8, 2005,[1] with a magnitude of 1.0074. It was a hybrid event, a narrow total eclipse, and beginning and ending as an annular eclipse.[2] 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 4.3 days after perigee (on April 4, 2005, at 12:10 UTC), the Moon's apparent diameter was larger.[3]
A partial eclipse was photographed from Nicaragua; in Bogota, several hundred schoolchildren watched the eclipse despite cloud cover.[5] In Cordoba, an expedition from Bogota's National University observed the eclipse.[5]
In Panama, where the eclipse was visible (and nearly total) from nearly the entire country, it was reported that hundreds of people had booked hotels to view it, including astronomers from the United States, Mexico, France, Belgium, Denmark, Iran and Spain.[6] While the totality of the eclipse occurred over the Pacific Ocean, it could be seen from some parts of the southern United States; it was reported that the southernmost parts of Florida had the best viewing conditions (with as much as 50% of the sun occluded),[2][7] although rainy conditions in part of the region meant the event was partially obscured.[5]
Observations
NASA's Goddard Space Flight Center astrophysicist Fred Espenak and Williams College professor Jay Pasachoff boarded the cruise ship Galapagos Legend and observed the eclipse from the sea west of the Galápagos Islands. The ship first docked at several islands in the Galapagos Islands from April 1 to 3, and then started sailing westward toward the path of totality on April 4. It was cloudy at first on April 8. The ship encountered relatively large wind and waves while sailing south to look for a location with clear sky. The clouds began to disperse from 2 pm, and the Sun could be seen through the thin clouds around 2:40. It cleared up later and during the totality, the weather was excellent and the observation was very successful. After another several days of sailing, the ship arrived at the Galápagos Islands again on April 12 and docked at several islands in the following days.[8]
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.
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.[12]
This eclipse is a part of Saros series 129, repeating every 18 years, 11 days, and containing 80 events. The series started with a partial solar eclipse on October 3, 1103. It contains annular eclipses from May 6, 1464 through March 18, 1969; hybrid eclipses from March 29, 1987 through April 20, 2023; and total eclipses from April 30, 2041 through July 26, 2185. The series ends at member 80 as a partial eclipse on February 21, 2528. 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 annularity was produced by member 34 at 5 minutes, 10 seconds on October 4, 1698, and the longest duration of totality will be produced by member 58 at 3 minutes, 43 seconds on June 25, 2131. All eclipses in this series occur at the Moon’s ascending node of orbit.[13]
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
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.
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.
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