A Lunar Eclipse Can Only Happen During a
A lunar eclipse occurs when the Moon moves into the Earth's shadow.[1] This can occur only when the Sun, Earth, and Moon are exactly or very closely aligned (in syzygy) with Earth betwixt the other two, and only on the night of a full moon. The type and length of a lunar eclipse depend on the Moon's proximity to either node of its orbit.[ citation needed ]
The reddish colour of totally eclipsed Moon is caused past Earth completely blocking directly sunlight from reaching the Moon, with the only light reflected from the lunar surface has been refracted by Earth'south atmosphere. This light appears reddish for the same reason that a sunset or sunrise does: the Rayleigh scattering of bluer light.
Different 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 dark side of Earth. A full lunar eclipse tin last up to nearly 2 hours, while a total solar eclipse lasts only upward to a few minutes at whatever given place, because the Moon's shadow is smaller. Also dissimilar solar eclipses, lunar eclipses are safe to view without any heart protection or special precautions, every bit they are dimmer than the full Moon.
For the date of the next eclipse, see § Contempo and forthcoming lunar eclipses.
Types of lunar eclipse
Earth's shadow can be divided into two distinctive parts: the umbra and penumbra. Earth totally occludes direct solar radiation within the umbra, the cardinal region of the shadow. However, since the Sunday'south diameter appears virtually one-quarter of Globe'south in the lunar sky, the planet but partially blocks direct sunlight within the penumbra, the outer portion of the shadow.
Penumbral lunar eclipse
This occurs when the Moon passes through Earth's penumbra. The penumbra causes a subtle dimming of the lunar surface, which is only visible to the naked centre when about seventy% of the Moon'due south bore has immersed into Earth'southward penumbra.[2] A special blazon of penumbral eclipse is a total penumbral lunar eclipse, during which the Moon lies exclusively within Earth's penumbra. Full penumbral eclipses are rare, and when these occur, the portion of the Moon closest to the umbra may appear slightly darker than the rest of the lunar disk.
Partial lunar eclipse
This occurs when just a portion of the Moon enters Earth's umbra, while a total lunar eclipse occurs when the entire Moon enters the planet's umbra. The Moon'southward average orbital speed is about one.03 km/s (two,300 mph), or a picayune more than its bore per hour, so totality may last up to nearly 107 minutes. Nevertheless, the total fourth dimension between the outset and the last contacts of the Moon's limb with World's shadow is much longer and could last up to 236 minutes.[3]
Total lunar eclipse
This occurs when the moon falls entirely within the earth's umbra. Just prior to complete entry, the brightness of the lunar limb-- the curved border of the moon still being hit past direct sunlight-- will cause the rest of the moon to appear comparatively dim. The moment the moon enters a complete eclipse, the entire surface will become more or less uniformly bright. Later, as the moon'south opposite limb is struck by sunlight, the overall disk volition again become obscured. This is because as viewed from the Earth, the brightness of a lunar limb is generally greater than that of the rest of the surface due to reflections from the many surface irregularities within the limb: sunlight striking these irregularities is ever reflected back in greater quantities than that striking more central parts, and is why the edges of full moons generally appear brighter than the rest of the lunar surface. This is like to the consequence of velvet cloth over a convex curved surface which to an observer volition appear darkest at the center of the curve. It will exist truthful of any planetary body with picayune or no temper and an irregular cratered surface (e.thousand., Mercury) when viewed contrary the Sun.[4]
Primal lunar eclipse
This is a total lunar eclipse during which the Moon passes through the centre of Earth's shadow, contacting the antisolar signal. This type of lunar eclipse is relatively rare.
The relative distance of the Moon from Earth at the time of an eclipse can impact the eclipse'southward elapsing. In particular, when the Moon is well-nigh apogee, the farthest point from Earth in its orbit, its orbital speed is the slowest. The diameter of Earth's umbra does not decrease appreciably within the changes in the Moon's orbital altitude. Thus, the concurrence of a totally eclipsed Moon nigh apogee volition lengthen the elapsing of totality.
Selenelion
A selenelion or selenehelion, besides called a horizontal eclipse, occurs where and when both the Dominicus and an eclipsed Moon can be observed at the same time. The event can only be observed just before dusk or just after sunrise, when both bodies will appear just above opposite horizons at nearly contrary points in the sky. A selenelion occurs during every total lunar eclipse-- it is an feel of the observer, not a planetary event carve up from the lunar eclipse itself. Typically, observers on Earth located on high mountain ridges undergoing simulated sunrise or false sunset at the same moment of a full lunar eclipse will exist able to experience it. Although during selenelion the Moon is completely within the Earth's umbra, both it and the Sun can be observed in the sky because atmospheric refraction causes each body to appear higher (i.e., more central) in the heaven than its true geometric planetary position.[v]
Timing
The timing of total lunar eclipses is determined by what are known as its "contacts" (moments of contact with Earth'south shadow):[6]
- P1 (Offset contact): Beginning of the penumbral eclipse. Earth's penumbra touches the Moon's outer limb.
- U1 (Second contact): Beginning of the partial eclipse. World's umbra touches the Moon's outer limb.
- U2 (3rd contact): Beginning of the total eclipse. The Moon'due south surface is entirely within Earth's umbra.
- Greatest eclipse: The peak stage of the total eclipse. The Moon is at its closest to the eye of Globe'due south umbra.
- U3 (4th contact): Cease of the total eclipse. The Moon's outer limb exits Globe'south umbra.
- U4 (5th contact): End of the partial eclipse. World's umbra leaves the Moon's surface.
- P4 (6th contact): Finish of the penumbral eclipse. Earth'south penumbra no longer makes contact with the Moon.
Danjon calibration
The following calibration (the Danjon scale) was devised by André Danjon for rating the overall darkness of lunar eclipses:[7]
- L = 0: Very nighttime eclipse. Moon almost invisible, especially at mid-totality.
- 50 = 1: Night eclipse, grey or brownish in coloration. Details distinguishable only with difficulty.
- L = 2: Deep red or rust-colored eclipse. Very dark central shadow, while outer edge of umbra is relatively brilliant.
- L = iii: Brick-red eclipse. Umbral shadow usually has a bright or yellow rim.
- L = 4: Very brilliant copper-red or orange eclipse. Umbral shadow is blue and has a very bright rim.
Lunar versus solar eclipse
In that location is oft confusion between a solar eclipse and a lunar eclipse. While both involve interactions betwixt the Sun, World, and the Moon, they are very unlike in their interactions.
Lunar eclipse appearance
The Moon does non completely darken as information technology passes through the umbra because of the refraction of sunlight past Globe's atmosphere into the shadow cone; if Earth had no atmosphere, the Moon would be completely dark during the eclipse.[viii] The ruby-red coloration arises because sunlight reaching the Moon must pass through a long and dense layer of World'south atmosphere, where it is scattered. Shorter wavelengths are more than likely to be scattered past the air molecules and small-scale particles; thus, the longer wavelengths predominate past the time the lite rays have penetrated the atmosphere. Human vision perceives this resulting light as ruby-red. This is the same result that causes sunsets and sunrises to plough the heaven a reddish colour. An culling style of conceiving this scenario is to realize that, as viewed from the Moon, the Sun would announced to exist setting (or rise) behind Globe.
The amount of refracted light depends on the amount of dust or clouds in the atmosphere; this too controls how much light is scattered. In general, the dustier the atmosphere, the more that other wavelengths of light will exist removed (compared to cherry calorie-free), leaving the resulting light a deeper red color. This causes the resulting coppery-ruddy hue of the Moon to vary from one eclipse to the side by side. Volcanoes are notable for expelling large quantities of dust into the atmosphere, and a large eruption shortly earlier an eclipse can accept a large effect on the resulting color.
Lunar eclipse in culture
Several cultures have myths related to lunar eclipses or allude to the lunar eclipse as existence a good or bad omen. The Egyptians saw the eclipse every bit a sow swallowing the Moon for a short time; other cultures view the eclipse as the Moon beingness swallowed by other animals, such as a jaguar in Mayan tradition, or a 3 legged toad in China. Some societies thought it was a demon swallowing the Moon, and that they could chase it abroad by throwing stones and curses at information technology.[ix] The Ancient Greeks correctly believed the Earth was round and used the shadow from the lunar eclipse as testify.[10] Some Hindus believe in the importance of bathing in the Ganges River post-obit an eclipse because it will assist to achieve salvation.[xi]
Inca
Similarly to the Mayans, the Inca believed that lunar eclipses occurred when a jaguar would swallow the Moon, which is why a claret moon looks red. The Incans too believed that in one case the jaguar finished eating the Moon, information technology could come downward and devour all the animals on Earth, so they would take spears and shout at the Moon to keep it abroad.[12]
Mesopotamians
The aboriginal Mesopotamians believed that a lunar eclipse was when the Moon was being attacked by seven demons. This set on was more than just one on the Moon, nonetheless, for the Mesopotamians linked what happened in the sky with what happened on the land, and considering the rex of Mesopotamia represented the state, the seven demons were thought to be besides attacking the king. In order to prevent this attack on the king, the Mesopotamians made someone pretend to be the rex then they would be attacked instead of the true king. After the lunar eclipse was over, the substitute king was made to disappear (possibly by poisoning).[12]
Chinese
In some Chinese cultures, people would ring bells to prevent a dragon or other wild animals from bitter the Moon.[xiii] In the nineteenth century, during a lunar eclipse, the Chinese navy fired its artillery because of this belief.[14] During the Zhou Dynasty in the Volume of Songs, the sight of a red Moon engulfed in darkness was believed to foreshadow famine or disease.[15]
Blood moon
Certain lunar eclipses have been referred to as "claret moons" in popular articles but this is non a scientifically-recognized term.[16] This term has been given two separate, simply overlapping, meanings.
The first, and simpler, significant relates to the cherry-red color a totally eclipsed Moon takes on to observers on Earth.[17] Equally sunlight penetrates the atmosphere of Earth, the gaseous layer filters and refracts the rays in such a style that the green to violet wavelengths on the visible spectrum scatter more strongly than the ruby-red, thus giving the Moon a cherry-red cast.[18]
The 2d significant of "blood moon" has been derived from this credible coloration by two fundamentalist Christian pastors, Mark Rush and John Hagee.[16] [19] They claimed that the 2014–xv "lunar tetrad" of four lunar eclipses coinciding with the feasts of Passover and Tabernacles matched the "moon turning to claret" described in the Volume of Joel of the Hebrew Bible.[19] This tetrad was claimed to herald the Second Coming of Christ and the Rapture as described in the Book of Revelation on the appointment of the first of the eclipses in this sequence on April 15, 2014.[twenty]
Occurrence
At least ii lunar eclipses and as many every bit five occur every year, although full lunar eclipses are significantly less mutual. If the appointment and time of an eclipse is known, the occurrences of upcoming eclipses are anticipated using an eclipse bicycle, like the saros.
Recent and forthcoming lunar eclipses
Eclipses occur only during an eclipse season, when the Sun appears to laissez passer near either node of the Moon'south orbit.
Lunar eclipse series sets from 2002–2005 | ||||||||
---|---|---|---|---|---|---|---|---|
Descending node | Ascending node | |||||||
Saros Photograph | Date View | Blazon Nautical chart | Gamma | Saros Photograph | Date View | Type Chart | Gamma | |
111 | 2002 May 26 | penumbral | 1.1759 | 116 | 2002 Nov 20 | penumbral | -i.1127 | |
121 | 2003 May 16 | full | 0.4123 | 126 | 2003 Nov 09 | total | -0.4319 | |
131 | 2004 May 04 | total | -0.3132 | 136 | 2004 Oct 28 | full | 0.2846 | |
141 | 2005 Apr 24 | penumbral | -ane.0885 | 146 | 2005 Oct 17 | fractional | 0.9796 | |
Last set | 2002 Jun 24 | Last prepare | 2001 Dec 30 | |||||
Side by side set up | 2006 Mar 14 | Next set | 2006 Sep 7 |
Lunar eclipse series sets from 2006–2009 | ||||||||
---|---|---|---|---|---|---|---|---|
Descending node | Ascending node | |||||||
Saros # and photo | Appointment Viewing | Blazon Chart | Gamma | Saros # and photo | Engagement Viewing | Type Chart | Gamma | |
113 | 2006 Mar xiv | penumbral | 1.0211 | 118 | 2006 Sep vii | fractional | -0.9262 | |
123 | 2007 Mar 03 | total | 0.3175 | 128 | 2007 Aug 28 | total | -0.2146 | |
133 | 2008 Feb 21 | total | -0.3992 | 138 | 2008 Aug sixteen | partial | 0.5646 | |
143 | 2009 Feb 09 | penumbral | -1.0640 | 148 | 2009 Aug 06 | penumbral | 1.3572 | |
Last ready | 2005 Apr 24 | Last prepare | 2005 October 17 | |||||
Next ready | 2009 Dec 31 | Adjacent set up | 2009 Jul 07 |
Lunar eclipse series sets from 2009–2013 | ||||||||
---|---|---|---|---|---|---|---|---|
Ascending node | Descending node | |||||||
Saros # Photo | Appointment Viewing | Type chart | Gamma | Saros # Photo | Date Viewing | Type nautical chart | Gamma | |
110 | 2009 Jul 07 | penumbral | -1.4916 | 115 | 2009 December 31 | partial | 0.9766 | |
120 | 2010 Jun 26 | fractional | -0.7091 | 125 | 2010 December 21 | total | 0.3214 | |
130 | 2011 Jun 15 | total | 0.0897 | 135 | 2011 Dec ten | total | -0.3882 | |
140 | 2012 Jun 04 | partial | 0.8248 | 145 | 2012 Nov 28 | penumbral | -1.0869 | |
150 | 2013 May 25 | penumbral | 1.5351 | |||||
Last set | 2009 Aug 06 | Terminal ready | 2009 Feb 9 | |||||
Next gear up | 2013 Apr 25 | Next fix | 2013 Oct 18 |
Lunar eclipse series sets from 2013–2016 | ||||||||
---|---|---|---|---|---|---|---|---|
Ascending node | Descending node | |||||||
Saros | Viewing date | Type | Gamma | Saros | Viewing date | Type | Gamma | |
112 | 2013 Apr 25 | Fractional | -1.0121 | 117 | 2013 Oct eighteen | Penumbral | 1.1508 | |
122 | 2014 Apr 15 | Total | -0.3017 | 127 | 2014 Oct 08 | Total | 0.3827 | |
132 | 2015 Apr 04 | Total | 0.4460 | 137 | 2015 Sep 28 | Full | -0.3296 | |
142 | 2016 Mar 23 | Penumbral | i.1592 | 147 | 2016 Sep xvi | Penumbral | -1.0549 | |
Concluding set up | 2013 May 25 | Last set up | 2012 Nov 28 | |||||
Side by side set up | 2017 Feb eleven | Next set | 2016 Aug 18 |
Lunar eclipse series sets from 2016–2020 | ||||||||
---|---|---|---|---|---|---|---|---|
Descending node | Ascending node | |||||||
Saros | Date | Type Viewing | Gamma | Saros | Date Viewing | Type Nautical chart | Gamma | |
109 | 2016 Aug 18 | Penumbral | 1.5641 | 114 | 2017 Feb eleven | Penumbral | -1.0255 | |
119 | 2017 Aug 07 | Partial | 0.8669 | 124 | 2018 Jan 31 | Full | -0.3014 | |
129 | 2018 Jul 27 | Total | 0.1168 | 134 | 2019 Jan 21 | Total | 0.3684 | |
139 | 2019 Jul sixteen | Partial | -0.6430 | 144 | 2020 Jan x | Penumbral | 1.2406 | |
149 | 2020 Jul 05 | Penumbral | -1.3639 | |||||
Last set | 2016 Sep 16 | Terminal fix | 2016 Mar 23 | |||||
Next set | 2020 Jun 05 | Side by side set | 2020 Nov 30 |
Lunar eclipse series sets from 2020–2023 | ||||||||
---|---|---|---|---|---|---|---|---|
Descending node | Ascending node | |||||||
Saros | Date | Blazon Viewing | Gamma | Saros | Appointment Viewing | Type Nautical chart | Gamma | |
111 | 2020 Jun 05 | Penumbral | 1.24063 | 116 | 2020 Nov thirty | Penumbral | -one.13094 | |
121 | 2021 May 26 | Total | 0.47741 | 126 | 2021 November xix | Partial | -0.45525 | |
131 | 2022 May sixteen | Full | -0.25324 | 136 | 2022 November 08 | Full | 0.25703 | |
141 | 2023 May 05 | Penumbral | -i.03495 | 146 | 2023 Oct 28 | Partial | 0.94716 | |
Last prepare | 2020 Jul 05 | Concluding set | 2020 Jan 10 | |||||
Side by side prepare | 2024 Mar 25 | Side by side set | 2024 Sep eighteen |
Lunar eclipse serial sets from 2024–2027 | ||||||
---|---|---|---|---|---|---|
Descending node | Ascending node | |||||
Saros | Date | Type Viewing | Saros | Date Viewing | Type Chart | |
113 | 2024 Mar 25 | Penumbral | 118 | 2024 Sep xviii | Fractional | |
123 | 2025 Mar 14 | Full | 128 | 2025 Sep 07 | Total | |
133 | 2026 Mar 03 | Total | 138 | 2026 Aug 28 | Partial | |
143 | 2027 February xx | Penumbral | 148 | 2027 Aug 17 | Penumbral | |
Final set | 2023 May 05 | Last gear up | 2023 October 28 | |||
Next set | 2028 Jan 12 | Next set | 2027 Jul 18 |
Lunar eclipse series sets from 2027–2031 | ||||||
---|---|---|---|---|---|---|
Descending node | Ascending node | |||||
Saros | Engagement Viewing | Blazon Chart | Saros | Date Viewing | Type Nautical chart | |
110 | 2027 Jul xviii | Penumbral | 115 | 2028 January 12 | Partial | |
120 | 2028 Jul 06 | Partial | 125 | 2028 Dec 31 | Total | |
130 | 2029 Jun 26 | Total | 135 | 2029 Dec 20 | Full | |
140 | 2030 Jun 15 | Partial | 145 | 2030 Dec 09 | Penumbral | |
150 | 2031 Jun 05 | Penumbral | ||||
Last prepare | 2027 Aug 17 | Last set | 2027 Feb 20 | |||
Next gear up | 2031 May 07 | Next set | 2031 Oct thirty |
Run across too
- Lists of lunar eclipses and List of 21st-century lunar eclipses
- Lunar occultation
- Moon illusion
- Orbit of the Moon
- Solar eclipse
References
- ^ McClure, Bruce (July 27, 2018). "Century's Longest Lunar Eclipse July 27". EarthSky . Retrieved August i, 2018.
- ^ H. Mucke, J. Meeus (1992). Canon of Lunar Eclipses -2002 to +2526 (3rd ed.). Astronomisches Büro Wien. p. V.
- ^ Karttunen, Hannu (2007). Fundamental Astronomy. Springer. p. 139. ISBN9783540341444.
- ^ "Lunar Limb Magic". Astronomy.com. 27 November 2018.
- ^ "Observing Weblog - In Search of Selenelion". Sky & Telescope. 2010-06-26. Archived from the original on 2011-12-20. Retrieved 2011-12-08 .
- ^ Clarke, Kevin. "On the nature of eclipses". Inconstant Moon. Cyclopedia Selenica. Retrieved 19 December 2010.
- ^ Deans, Paul; MacRobert, Alan M. (July 16, 2006). "Observing and Photographing Lunar Eclipses". Sky & Telescope. F+W.
- ^ Espenak, Fred; Meeus, Jean. "Visual Appearance of Lunar Eclipses". NASA.
The troposphere and stratosphere act together equally a band-shaped lens that refracts heavily reddened sunlight into World's umbral shadow.
- ^ Littmann, Mark; Espenak, Fred; Willcox, Ken (2008). "Chapter 4: Eclipses in Mythology". Totality Eclipses of the Dominicus (tertiary ed.). New York: Oxford University Press. ISBN978-0-19-953209-iv.
- ^ Pollack, Rebecca. "Aboriginal Myths Revised with Lunar Eclipse". Academy of Maryland. Retrieved 2 Oct 2014.
- ^ Ani. "Hindus take a dip in the Ganges during Lunar Eclipse". Yahoo News . Retrieved 2 October 2014.
- ^ a b Lee, Jane (fourteen April 2014). "Lunar Eclipse Myths From Around the Globe". National Geographic . Retrieved 9 October 2014.
- ^ Quilas, Ma Evelyn. "Interesting Facts and Myths about Lunar Eclipse". LA Times . Retrieved 2 Oct 2014.
- ^ "Mythology of the Lunar Eclipse". LifeAsMyth.com.
- ^ Kaul, Gayatri (15 June 2011). "What Lunar Eclipse Means in Dissimilar Parts of the World". India.com . Retrieved vi October 2014.
- ^ a b Sappenfield, Mark (xiii April 2014). "Blood Moon to arrive Monday night. What is a Blood Moon?". Christian Scientific discipline Monitor . Retrieved 8 February 2018.
- ^ Nigro, Nicholas (2010). Knack Night Sky: Decoding the Solar System, from Constellations to Blackness Holes. Earth Pequot. pp. 214–5. ISBN978-0-7627-6604-eight.
- ^ "All you lot demand to know about the 'blood moon'". theguardian. 28 September 2015.
- ^ a b "What is a Claret Moon?". Earth & Sky. 24 April 2014. Retrieved thirty May 2014.
- ^ Bailey, Sarah Pulliam (15 April 2014). "'Blood moon' sets off apocalyptic debate among some Christians". The Washington Post. Organized religion News Service. Retrieved 8 Feb 2018.
- ^ "Lunar Eclipse @ ESO". European Southern Observatory. Retrieved xiv August 2017.
Further reading
- Bao-Lin Liu, Canon of Lunar Eclipses 1500 B.C.-A.D. 3000. Willmann-Bong, Richmond VA, 1992
- Jean Meeus and Hermann Mucke Catechism of Lunar Eclipses -2002 to +2526 (3rd edition). Astronomisches Büro, Vienna, 1992
- Espenak, F., Fifty Year Catechism of Lunar Eclipses: 1986–2035. NASA Reference Publication 1216, 1989
- Espenak, F. Thousand Year Canon of Lunar Eclipses 1501 to 2500, Astropixels Publishing, Portal AZ, 2014
External links
- Lunar Eclipse Essentials: video from NASA
- Animated explanation of the mechanics of a lunar eclipse, University of South Wales
- U.Due south. Navy Lunar Eclipse Computer
- NASA Lunar Eclipse Page
- Search among the 12,064 lunar eclipses over five millennium and display interactive maps
- Lunar Eclipses for Beginners
- Tips on photographing the lunar eclipse from New York Institute of Photography
- Lunar Eclipse 08 October 2014 on YouTube
Source: https://en.wikipedia.org/wiki/Lunar_eclipse
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