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The 1690s BC was a decade lasting from January 1, 1699, BC to December 31, 1690, BC.
The 1660s BC was a decade lasting from January 1, 1669 BC to December 31, 1660 BC.
The 1520s BC was a decade lasting from January 1, 1529 BC to December 31, 1520 BC.
The 1490s BC was a decade lasting from January 1, 1499 BC to December 31, 1490 BC.
The saros is a period of exactly 223 synodic months, approximately 6585.3211 days, or 18 years, 10, 11, or 12 days, and 8 hours, that can be used to predict eclipses of the Sun and Moon. One saros period after an eclipse, the Sun, Earth, and Moon return to approximately the same relative geometry, a near straight line, and a nearly identical eclipse will occur, in what is referred to as an eclipse cycle. A sar is one half of a saros.
The inex is an eclipse cycle of 10,571.95 days. The cycle was first described in modern times by Crommelin in 1901, but was named by George van den Bergh who studied it in detail half a century later. It has been suggested that the cycle was known to Hipparchos. One inex after an eclipse of a particular saros series there will be an eclipse in the next saros series, unless the latter saros series has come to an end.
A total lunar eclipse took place on 15 April 2014. It was the first of two total lunar eclipses in 2014, and the first in a tetrad. Subsequent eclipses in the tetrad are those of 8 October 2014, 4 April 2015, and 28 September 2015. Occurring 6.7 days after apogee, the Moon's apparent diameter was smaller.
A penumbral lunar eclipse took place on Saturday, August 8, 1998, the second of three lunar eclipses that year.
A total lunar eclipse took place on 4 April 2015. It is the former of two total lunar eclipses in 2015, and the third in a tetrad. Other eclipses in the tetrad are those of 15 April 2014, 8 October 2014, and 28 September 2015.
A penumbral lunar eclipse took place on Thursday, 18 August 2016. It was the second of three lunar eclipses in 2016. This was 3.7 days before the Moon reached perigee. There are multiple ways to determine the boundaries of Earth's shadow, so this was a miss according to some sources. The HM National Almanac Office's online canon of eclipses lists this event as the last eclipse on Saros Series 109, while NASA lists August 8, 1998 as the last eclipse of the series, and has this event missing the shadow.
A total lunar eclipse will take place on May 26, 2040. The northern limb of the Moon will pass through the center of the Earth's shadow. This is the second central lunar eclipse of Saros series 131.
A total lunar eclipse took place on Tuesday, July 6, 1982, the second of three total lunar eclipses in 1982, and the only one that was in the descending node. A dramatic total eclipse lasting 1 hour and 46 minutes plunged the full Moon into deep darkness, as it passed right through the centre of the Earth's umbral shadow. While the visual effect of a total eclipse is variable, the Moon may have been stained a deep orange or red colour at maximum eclipse. This was a great spectacle for everyone who saw it. The partial eclipse lasted for 3 hours and 56 minutes in total.
A total lunar eclipse took place on Friday, March 24, 1978, the first of two total lunar eclipses in 1978. The moon passed through the center of the Earth's shadow. The Moon was plunged into darkness for 1 hour, 30 minutes and 40.2 seconds, in a deep total eclipse which saw the Moon 45.179% of its diameter inside the Earth's umbral shadow. The visual effect of this depends on the state of the Earth's atmosphere, but the Moon may have been stained a deep red colour. The partial eclipse lasted for 3 hours, 38 minutes and 34.5 seconds in total.
A partial lunar eclipse took place on Monday, April 4, 1977, the first of two lunar eclipses in 1977. At maximum eclipse, a small bite out of the Moon should have been visible. The eclipse lasted for 1 hour and 34.76 minutes, with just 19.289% of the Moon in shadow at maximum.
A penumbral lunar eclipse took place at the Moon's descending node of the orbit on Tuesday, August 26, 1980, the last of three penumbral lunar eclipses in 1980 with a penumbral magnitude of 0.70891. This subtle penumbral eclipse may have been visible to a skilled observer at maximum eclipse. 70.891% of the Moon's disc was partially shaded by the Earth, which caused a gentle shadow gradient across its disc at maximum; the eclipse as a whole lasted 3 hours, 34 minutes and 26 seconds.
A total lunar eclipse will take place on June 17, 2076. The moon will pass through the center of the Earth's shadow. While the visual effect of a total eclipse is variable, the Moon may be stained a deep orange or red color at maximum eclipse. With a gamma value of only −0.0452 and an umbral eclipse magnitude of 1.7943, this is the second greatest eclipse in Saros series 131 as well as the largest and darkest lunar eclipse between June 26, 2029 and June 28, 2094. Overall, it will be the third largest and darkest lunar eclipse of the 21st century. While it will have similar values to the lunar eclipse of July 16, 2000, totality will not last over 106 minutes due to the moon's relatively large apparent size as seen from Earth and greater speed in its elliptical orbit. Totality's expected to last 100 minutes 34 seconds from 9:11:39 to 10:52:15 with the greatest point at 10:01:57 UTC.
A total lunar eclipse took place on Sunday, January 30, 1972, the first of two lunar eclipses in 1972. The moon entered the Earth's penumbral shadow at 30 January 1972 08:03:12.5 UTC and exited at 30 January 1972 13:43:37.9 UTC. The moon entered the Earth's umbral shadow at 30 January 1972 09:11:38.4 UTC and exited at 30 January 1972 12:35:03.1 UTC. Totality lasted 34 minutes, 47.7 seconds, between 10:35:57.4 UTC and 11:10:45.1 UTC. The moon was 6.6 days before apogee, making it 1.6% smaller than average, only 0.2% larger than the July 1972's lunar eclipse.
A total lunar eclipse took place on Sunday, July 26, 1953.
A total penumbral lunar eclipse is a lunar eclipse that occurs when the Moon becomes completely immersed in the penumbral cone of the Earth without touching the umbra.
A total lunar eclipse will take place on May 6, 2069. The eclipse will be a dark one with the southern tip of the Moon passing through the center of the Earth's shadow. This is the first central eclipse of Saros series 132.
References
- ↑ "NASA - Catalog of Lunar Eclipses in Saros 34". eclipse.gsfc.nasa.gov. Retrieved 2021-12-10.
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