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Lunar eclipse
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For other uses, see Lunar eclipse (disambiguation).
Not to be confused with Solar eclipse.
Recent total eclipses

April 15, 2014
October 8, 2014

April 4, 2015
September 28, 2015
A lunar eclipse occurs when the Moon passes directly behind the Earth into its umbra (shadow). This can occur only when the sun, Earth, and moon are aligned (in "syzygy") exactly, or very closely so, with the Earth in the middle. Hence, a lunar eclipse can occur only the night of a full moon. The type and length of an eclipse depend upon the Moon's location relative to its orbital nodes.
A total lunar eclipse has the direct sunlight completely blocked by the earth's shadow. The only light seen is refracted through the earth's shadow. This light looks red for the same reason that the sunset looks red, due to rayleigh scattering of the more blue light. Because of its reddish color, a total lunar eclipse is sometimes called a blood moon.
Unlike a solar eclipse, which can be viewed only from a certain relatively small area of the world, a lunar eclipse may be viewed from anywhere on the night side of the Earth. A lunar eclipse lasts for a few hours, whereas a total solar eclipse lasts for only a few minutes at any given place, due to the smaller size of the Moon's shadow. Also unlike solar eclipses, lunar eclipses are safe to view without any eye protection or special precautions, as they are dimmer than the full moon.
For the date of the next eclipse see the section Recent and forthcoming lunar eclipses.
Contents
[hide]
1 Types of lunar eclipse
1.1 Selenelion
2 Timing
3 Danjon scale
4 Lunar versus solar eclipse
4.1 Lunar eclipse appearance
5 March 1504 lunar eclipse
6 Lunar eclipse in culture
6.1 Incans
6.2 Mesopotamians
6.3 Chinese
7 Blood moon
8 Occurrence
8.1 Recent and forthcoming lunar eclipses
9 See also
10 References
11 Further reading
12 External links
Types of lunar eclipse
Schematic diagram of the shadow cast by the Earth. Within the central umbra shadow, the moon is totally shielded from direct illumination by the Sun. In contrast, within the penumbra shadow, only a portion of Sunlight is blocked.
A total penumbral lunar eclipse dims the moon in direct proportion to the area of the Sun's disk blocked by the Earth. This comparison shows the southern shadow penumbral lunar eclipse of January 1999 (left) to the moon outside of the shadow (right) demonstrates this subtle dimming.
The shadow of the Earth can be divided into two distinctive parts: the umbra and penumbra. Within the umbra, there is no direct solar radiation. However, as a result of the Sun's large angular size, solar illumination is only partially blocked in the outer portion of the Earth's shadow, which is given the name penumbra.
A penumbral eclipse occurs when the moon passes through the Earth's penumbra. The penumbra causes a subtle darkening of the moon's surface. A special type of penumbral eclipse is a total penumbral eclipse, during which the Moon lies exclusively within the Earth's penumbra. Total penumbral eclipses are rare, and when these occur, that portion of the moon which is closest to the umbra can appear somewhat darker than the rest of the moon.
A partial lunar eclipse occurs when only a portion of the moon enters the umbra. When the moon travels completely into the Earth's umbra, one observes a total lunar eclipse. The moon's speed through the shadow is about one kilometer per second (2,300 mph), and totality may last up to nearly 107 minutes. Nevertheless, the total time between the moon's first and last contact with the shadow is much longer and could last up to four hours.[1] The relative distance of the moon from the Earth at the time of an eclipse can affect the eclipse's duration. In particular, when the moon is near its apogee, the farthest point from the Earth in its orbit, its orbital speed is the slowest. The diameter of the umbra does not decrease appreciably within the changes in the orbital distance of the moon. Thus, a totally eclipsed moon occurring near apogee will lengthen the duration of totality.
A central lunar eclipse is a total lunar eclipse during which the moon passes through the centre of the Earth's shadow. These are relatively rare.
Selenelion
October 2014 lunar eclipse viewed from Minneapolis, with a partially eclipsed Moon still up after sunrise, seen as sunlight on the tree on the right.
A selenelion or selenehelion occurs when both the Sun and the eclipsed Moon can be observed at the same time. This can happen only just before sunset or just after sunrise, and both bodies will appear just above the horizon at nearly opposite points in the sky. This arrangement has led to the phenomenon being referred to as a horizontal eclipse. There are typically a number of high ridges undergoing sunrise or sunset that can see it. Although the moon is in the Earth’s umbra, the Sun and the eclipsed Moon can both be seen at the same time because the refraction of light through the Earth’s atmosphere causes each of them to appear higher in the sky than their true geometric position.[2]
Timing
As viewed from Earth, the Earth’s shadow can be imagined as two concentric circles. As the diagram illustrates, the type of lunar eclipse is defined by the path taken by the Moon as it passes through Earth’s shadow. If the moon passes through the outer circle but does not reach the inner circle, it is a penumbral eclipse; if only a portion of the moon passes through the inner circle, it is a partial eclipse; and if entire Moon passes through the inner circle at some point, it is a total eclipse.
Contact points relative to the Earth's umbral and penumbral shadows, here with the Moon near is descending node
The timing of total lunar eclipses are determined by its contacts:[3]
P1 (First contact): Beginning of the penumbral eclipse. Earth's penumbra touches the Moon's outer limb.
U1 (Second contact): Beginning of the partial eclipse. Earth's umbra touches the Moon's outer limb.
U2 (Third contact): Beginning of the total eclipse. The Moon's surface is entirely within Earth's umbra.
Greatest eclipse: The peak stage of the total eclipse. The Moon is at its closest to the center of Earth's umbra.
U3 (Fourth contact): End of the total eclipse. The Moon's outer limb exits Earth's umbra.
U4 (Fifth contact): End of the partial eclipse. Earth's umbra leaves the Moon's surface.
P4 (Sixth contact): End of the penumbral eclipse. Earth's penumbra no longer makes contact with the Moon.
Danjon scale
The following scale (the Danjon scale) was devised by André Danjon for rating the overall darkness of lunar eclipses:[4]
L=0: Very dark eclipse. Moon almost invisible, especially at mid-totality.
L=1: Dark eclipse, gray 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 bright.
L=3: Brick-red eclipse. Umbral shadow usually has a bright or yellow rim.
L=4: Very bright copper-red or orange eclipse. Umbral shadow is bluish and has a very bright rim.
Lunar versus solar eclipse
A solar eclipse occurs in the day time at new moon, when the moon is between the Earth and the sun, while a lunar eclipse occurs at night when the Earth passes between the Sun and the Moon.
There is often confusion between a solar and lunar eclipse. While both involve interactions between the sun, Earth, and moon, they are very different in their interactions.
Lunar eclipse appearance
A lunar eclipse occurs in two regions, an outer penumbral shadow where the sunlight is dimmed, and an inner umbral shadow, where much dimmer sunlight only exists by refraction through the Earth's atmosphere, leaving a red color. This can be seen in different exposures of a partial lunar eclipse, for example here with exposures of 1/80, 2/5, and 2 seconds.
The moon does not completely disappear as it passes through the umbra because of the refraction of sunlight by the Earth's atmosphere into the shadow cone; if the Earth had no atmosphere, the Moon would be completely dark during an eclipse.[5] The reddish coloration arises because sunlight reaching the Moon must pass through a long and dense layer of the Earth's atmosphere, where it is scattered. Shorter wavelengths are more likely to be scattered by the air molecules and the small particles, and so by the time the light has passed through the atmosphere, the longer wavelengths dominate. This resulting light we perceive as red. This is the same effect that causes sunsets and sunrises to turn the sky a reddish color; an alternative way of considering the problem is to realize that, as viewed from the moon, the sun would appear to be setting (or rising) behind the Earth.
From the Moon, a lunar eclipse would show a ring of reddish-orange light surrounding a dark Earth in the sky.
The amount of refracted light depends on the amount of dust or clouds in the atmosphere; this also controls how much light is scattered. In general, the dustier the atmosphere, the more that other wavelengths of light will be removed (compared to red light), leaving the resulting light a deeper red color. This causes the resulting coppery-red hue of the moon to vary from one eclipse to the next. Volcanoes are notable for expelling large quantities of dust into the atmosphere, and a large eruption shortly before an eclipse can have a large effect on the resulting color.
March 1504 lunar eclipse
Christopher Columbus predicting the lunar eclipse.
Main article: March 1504 lunar eclipse
When Christopher Columbus came to the New World—specifically, the north coast of Jamaica—he was able to use European scientific understanding to correctly predict a lunar eclipse. The event is known as the March 1504 lunar eclipse and occurred when Columbus, after he wanted to be seen as god-like, stated that he would make the moon disappear during the night of February 29, 1504. The reason Columbus wanted to prove he could make the moon disappear is because he and his crew were eating a great deal of the inhabitants' food, and the inhabitants refused to feed them anymore. Columbus was right in his prediction, for he used astronomical tables and local clocks in order to predict when the lunar eclipse would happen and was able to convince the inhabitants that he had the power to make the moon disappear and then reappear. After the inhabitants believed that Columbus was truly able to make the moon disappear, they begged him to return the moon to its previous form, and after roughly an allotted amount of time (the amount of time Columbus discerned to be how long the eclipse would last), Columbus agreed to return the moon, and the moon began to reappear. The next day, the inhabitants gave Columbus and his crew the food they desired.[6]
Lunar eclipse in culture
Several cultures have myths related to lunar eclipses or allude to the lunar eclipse as being a good or bad omen. The Egyptians saw the eclipse as a sow swallowing the moon for a short time; other cultures view the eclipse as the moon being swallowed by other animals, such as a jaguar in Mayan tradition, or a three legged toad in China. Some societies thought it was a demon swallowing the moon, and that they could chase it away by throwing stones and curses at it.[7] The Greeks were ahead of their time when they said the Earth was round and used the shadow from the lunar eclipse as evidence.[8] Some Hindus believe in the importance of bathing in the Ganges River following an eclipse because it will help to achieve salvation.[9]
Incans
Similarly to the Mayans, the Incans believed that lunar eclipses occurred when a jaguar would eat the moon, which is why a blood moon looks red. The Incans also believed that once the jaguar finished eating the moon, it could come down and devour all the animals on Earth, so they would take spears and shout at the moon to keep it away.[10]
Mesopotamians
The ancient Mesopotamians believed that a lunar eclipse was when the moon was being attacked by seven demons. This attack was more than just one on the moon, however, for the Mesopotamians linked what happened in the sky with what happened on the land, and because the king of Mesopotamia represented the land, the seven demons were thought to be also attacking the king. In order to prevent this attack on the king, the Mesopotamians made someone pretend to be the king so 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).[10]
Chinese
In some Chinese cultures, people would ring bells to prevent a dragon or other wild animals from biting the moon.[11] In the nineteenth century, during a lunar eclipse, the Chinese navy fired its artillery because of this belief.[12] During the Zhou Dynasty in the Book of Songs, the sight of a red moon engulfed in darkness was believed to foreshadow famine or disease.[13]
Blood moon
See also: Blood Moon Prophecy
Due to its reddish color, a totally eclipsed moon is sometimes referred to as a "blood moon".[14] In addition, in the 2010s the media started to associate the term with the four full moons of a lunar tetrad, especially the 2014–15 tetrad coinciding with the feasts of Passover and Tabernacles. A lunar tetrad is a series of four consecutive total lunar eclipses, spaced six months apart.[15][16]
Blood Moon is not a scientific term but has come to be used due to the reddish color seen on a Super Moon during the lunar eclipse. When sunlight passes through the earth's atmosphere, it filters and refracts in such a way that the green to violet lights on the spectrum scatters more strongly than the red light. This results the moon to get more red light[17]
Occurrence
Time-lapse sequence of lunar eclipse visible at ESO headquarters, 7 Aug 2017.[18]
Lunar Eclipse Transition
See also: Saros (astronomy) and Eclipse cycle
Every year, there are at least two lunar eclipses and as many as five, although total lunar eclipses are significantly less common. If one knows the date and time of an eclipse, it is possible to predict the occurrence of other eclipses using an eclipse cycle like the saros.
Recent and forthcoming lunar eclipses
Main article: List of 21st-century lunar eclipses
Further information: Lists of lunar eclipses
Eclipses only occur during an eclipse season, when the Sun is close to either the ascending or descending node of the Moon.
[show]Lunar eclipse series sets from 1998–2002
Descending node
Ascending node
Saros
Date
Viewing
Type
Chart
Saros
Date
Viewing
Type
Chart
109
1998 Aug 08
Penumbral
114
1999 Jan 31
Penumbral
119
1999 Jul 28
Partial
124
2000 Jan 21
Total
129
2000 Jul 16
Total
134
2001 Jan 09
Total
139
2001 Jul 05
Partial
144
2001 Dec 30
Penumbral
149
2002 Jun 24
Penumbral
Last set
1998 Sep 06
Last set
1998 Mar 13
Next set
2002 May 26
Next set
2002 Nov 20
[show]Lunar eclipse series sets from 2002–2005
Descending node
Ascending node
Saros
Photo
Date
View
Type
Chart
Saros
Photo
Date
View
Type
Chart
111
2002 May 26
penumbral
116
2002 Nov 20
penumbral
121
2003 May 16
total
126
2003 Nov 09
total
131
2004 May 04
total
136
2004 Oct 28
total
141
2005 Apr 24
penumbral
146
2005 Oct 17
partial
Last set
2002 Jun 24
Last set
2001 Dec 30
Next set
2006 Mar 14
Next set
2006 Sep 7
[show]Lunar eclipse series sets from 2006–2009
Descending node
Ascending node
Saros #
and photo
Date
Viewing
Type
Chart
Saros #
and photo
Date
Viewing
Type
Chart
113
2006 Mar 14
penumbral
118
2006 Sep 7
partial
123
2007 Mar 03
total
128
2007 Aug 28
total
133
2008 Feb 21
total
138
2008 Aug 16
partial
143
2009 Feb 09
penumbral
148
2009 Aug 06
penumbral
Last set
2005 Apr 24
Last set
2005 Oct 17
Next set
2009 Dec 31
Next set
2009 Jul 07
[show]Lunar eclipse series sets from 2009–2013
Ascending node
Descending node
Saros #
Photo
Date
Viewing
Type
chart
Saros #
Photo
Date
Viewing
Type
chart
110
2009 July 07
penumbral
115
2009 Dec 31
partial
120
2010 June 26
partial
125
2010 Dec 21
total
130
2011 June 15
total
135
2011 Dec 10
total
140
2012 June 04
partial
145
2012 Nov 28
penumbral
150
2013 May 25
penumbral
Last set
2009 Aug 06
Last set
2009 Feb 9
Next set
2013 Apr 25
Next set
2013 Oct 18
[show]Lunar eclipse series sets from 2013–2016
Ascending node
Descending node
Saros
Viewing
date
Type
Saros
Viewing
date
Type
112
2013 Apr 25
Partial
117
2013 Oct 18
Penumbral
122
2014 Apr 15
Total
127
2014 Oct 08
Total
132
2015 Apr 04
Total
137
2015 Sep 28
Total
142
2016 Mar 23
Penumbral
147
2016 Sep 16
Penumbral
Last set
2013 May 25
Last set
2012 Nov 28
Next set
2017 Feb 11
Next set
2016 Aug 18
[show]Lunar eclipse series sets from 2016–2020
Descending node
Ascending node
Saros
Date
Type
Viewing
Saros
Date
Viewing
Type
Chart
109
2016 Aug 18
Penumbral
114
2017 Feb 11
Penumbral
119
2017 Aug 07
Partial
124
2018 Jan 31
Total
129
2018 Jul 27
Total
134
2019 Jan 21
Total
139
2019 Jul 16
Partial
144
2020 Jan 10
Penumbral
149
2020 Jul 05
Penumbral
Last set
2016 Sep 16
Last set
2016 Mar 23
Next set
2020 Jun 05
Next set
2020 Nov 30
See also
Moon portal
Book: Lunar Eclipses
Lists of lunar eclipses and List of 21st-century lunar eclipses
Moon illusion
Orbit of the Moon
References
Jump up ^ Hannu Karttunen. Fundamental Astronomy. Springer.
Jump up ^ "In Search of Selenelion". Observing Blog - SkyandTelescope.com. 2010-06-26. Retrieved 2011-12-08.
Jump up ^ Clarke, Kevin. "On the nature of eclipses". Inconstant Moon. Cyclopedia Selenica. Retrieved 19 December 2010.
Jump up ^ Paul Deans and Alan M. MacRobert (July 16, 2006). "Observing and Photographing Lunar Eclipses". Sky & Telescope. F+W. CS1 maint: Uses authors parameter (link)
Jump up ^ Fred Espenak and Jean Meeus. "Visual Appearance of Lunar Eclipses". NASA. The troposphere and stratosphere act together as a ring-shaped lens that refracts heavily reddened sunlight into Earth's umbral shadow
Jump up ^ Peterson, Ivars. "The Eclipse That Saved Columbus". ScienceNews. Society for Science & the Public. Retrieved 26 April 2017.
Jump up ^ Littmann, Mark; Espenak, Fred; Willcox, Ken (2008). "Chapter 4: Eclipses in Mythology". Totality Eclipses of the Sun (3rd ed.). New York: Oxford University Press. ISBN 978-0-19-953209-4. Retrieved 17 December 2014.
Jump up ^ Pollack, Rebecca. "Ancient Myths Revised with Lunar Eclipse". University of Maryland. Retrieved 2 October 2014.
Jump up ^ Ani. "Hindus take a dip in the Ganges during Lunar Eclipse". Yahoo News. Retrieved 2 October 2014.
^ Jump up to: a b Lee, Jane. "Lunar Eclipse Myths From Around the World". National Geographic. Retrieved 9 October 2014.
Jump up ^ Quilas, Ma Evelyn. "Interesting Facts and Myths about Lunar Eclipse". LA Times. Retrieved 2 October 2014.
Jump up ^ "MYTHOLOGY OF THE LUNAR ECLIPSE".
Jump up ^ Kaul, Gayatri. "What Lunar Eclipse Means in Different Parts of the World". India.com. Retrieved 6 October 2014.
Jump up ^ Nigro, Nicholas (2010). Knack Night Sky: Decoding the Solar System, from Constellations to Black Holes. Globe Pequot. pp. 214–5. ISBN 978-0-7627-6604-8.
Jump up ^ Sappenfield, Mark (13 April 2014). "Blood Moon to arrive Monday night. What is a Blood Moon?". Christian Science Monitor. Retrieved 30 May 2014.
Jump up ^ "What is a Blood Moon?". Earth & Sky. 24 April 2014. Retrieved 30 May 2014.
Jump up ^ "All you need to know about the 'blood moon'". theguardian. 28 September 2015.
Jump up ^ "Lunar Eclipse @ ESO". www.eso.org. Retrieved 14 August 2017.
Further reading
Bao-Lin Liu, Canon of Lunar Eclipses 1500 B.C.-A.D. 3000, 1992
Jean Meeus and Hermann Mucke Canon of Lunar Eclipses. Astronomisches Büro, Vienna, 1983
Espenak, F., Fifty Year Canon of Lunar Eclipses: 1986-2035. NASA Reference Publication 1216, 1989
External links
Find more aboutLunar eclipseat Wikipedia's sister projects
Definitions from Wiktionary
Media from Commons
News from Wikinews
Texts from Wikisource
Textbooks from Wikibooks
"Lunar Eclipse Essentials": video from NASA
Animated explanation of the mechanics of a lunar eclipse, University of South Wales
U.S. 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
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Lunar eclipses
by Saros series
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
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116
117
118
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120
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143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163

Partial eclipses
1950–2049
1952 Feb
1952 Aug
1954 Jul
1955 Nov
1956 May
1958 May
1959 Mar
1961 Mar
1961 Aug
1963 Jul
1965 Jun
1970 Feb
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1972 Jul
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1999 Jul
2001 Jul
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2028 Jan
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2030 Jun
2034 Sep
2035 Aug
2037 Jul
2039 Jun
2039 Nov
2041 May
2041 Nov
2046 Jan
2046 Jul
2048 Jun

Total eclipses
1950–2049
1950 Apr
1950 Sep
1953 Jan
1953 Jul
1954 Jan
1956 Nov
1957 May
1957 Nov
1960 Mar
1960 Sep
1963 Dec
1964 Jun
1964 Dec
1967 Apr
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2036 Feb
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Partial
Previous penumbral: 2017 Feb 11
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1963 Jan 09
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2053 Aug 29
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