A total

lunar eclipse A lunar eclipse is an astronomical event that occurs when the Moon moves into the Earth's shadow, causing the Moon to be darkened. Such an alignment occurs during an eclipse season, approximately every six months, during the full moon phase, ...

occurred at the Moon’s

ascending node An orbital node is either of the two points where an orbit intersects a plane of reference to which it is inclined. A non-inclined orbit, which is contained in the reference plane, has no nodes. Planes of reference Common planes of referenc ...

of orbit on Saturday, April 4, 2015, with an umbral

magnitude Magnitude may refer to: Mathematics *Euclidean vector, a quantity defined by both its magnitude and its direction *Magnitude (mathematics), the relative size of an object *Norm (mathematics), a term for the size or length of a vector *Order of ...

of 1.0019. A lunar eclipse occurs when the

Moon The Moon is Earth's only natural satellite. It Orbit of the Moon, orbits around Earth at Lunar distance, an average distance of (; about 30 times Earth diameter, Earth's diameter). The Moon rotation, rotates, with a rotation period (lunar ...

moves into the

Earth's shadow Earth's shadow (or Earth shadow) is the shadow that Earth itself casts through its atmosphere and into outer space, toward the antisolar point. During the twilight period (both early dusk and late dawn), the shadow's visible fringe – someti ...

, causing the Moon to be darkened. A total lunar eclipse occurs when the Moon's near side entirely passes into the Earth's umbral shadow. Unlike a

solar eclipse A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby obscuring the view of the Sun from a small part of Earth, totally or partially. Such an alignment occurs approximately every six months, during the eclipse season i ...

, which can only be viewed from a relatively small area of the world, a lunar eclipse may be viewed from anywhere on the

night Night, or nighttime, is the period of darkness when the Sun is below the horizon. Sunlight illuminates one side of the Earth, leaving the other in darkness. The opposite of nighttime is daytime. Earth's rotation causes the appearance of ...

side of Earth. A total lunar eclipse can last up to nearly two hours, while a total solar eclipse lasts only a few minutes at any given place, because the Moon's

shadow A shadow is a dark area on a surface where light from a light source is blocked by an object. In contrast, shade occupies the three-dimensional volume behind an object with light in front of it. The cross-section of a shadow is a two-dimensio ...

is smaller. Occurring about 3.1 days after

apogee An apsis (; ) is the farthest or nearest point in the orbit of a planetary body about its primary body. The line of apsides (also called apse line, or major axis of the orbit) is the line connecting the two extreme values. Apsides perta ...

(on April 1, 2015, at 9:00 UTC), the Moon's apparent diameter was smaller. This lunar eclipse is the third of a

tetrad Tetrad ('group of 4') or tetrade may refer to: * Tetrad (area), an area 2 km x 2 km square * Tetrad (astronomy), four total lunar eclipses within two years * Tetrad (chromosomal formation) * Tetrad (general relativity), or frame field ** Tetra ...

, with four total lunar eclipses in series, the others being on April 15, 2014; October 8, 2014; and September 28, 2015. This is the 30th member of

Lunar Saros 132 Saros cycle, Saros series 132 for lunar eclipses occurs at the moon's ascending node, repeating every 18 years 11 and 1/3 days. It contains 71 member events, including 44 umbral lunar eclipses (32 partial lunar eclipses and 12 total lunar eclipses ...

, and the first total eclipse of the series. The previous event was the

March 1997 lunar eclipse A partial lunar eclipse occurred at the Moon’s Lunar node, ascending node of orbit on Monday, March 24, 1997, with an umbral Magnitude of eclipse, magnitude of 0.9195. A lunar eclipse occurs when the Moon moves into the Earth's shadow, causing t ...

, being slightly partial. It occurred on

Easter Sunday Easter, also called Pascha (Aramaic: פַּסְחָא , ''paskha''; Greek language, Greek: πάσχα, ''páskha'') or Resurrection Sunday, is a Christian festival and cultural holiday commemorating the resurrection of Jesus from the dead, de ...

( Gregorian only).

Duration

Totality lasted only 4 minutes and 43 seconds, making it the shortest lunar totality in almost five centuries since October 17, 1529 (which lasted 1 minute and 42 seconds). It was claimed by some that due to the oblateness of the Earth, it may have actually just been a partial eclipse. It was the sixth total lunar eclipse out of nine with totality under 5 minutes in a five millennium period between 2,000 BC and 3,000 AD. The eclipsed moon was 12.9% smaller in apparent diameter than the supermoon September 2015 lunar eclipse, measured as 29.66' and 33.47' in diameter from the center of the Earth. It occurred 3 days past

at 29.42'. : Supermoon lunar eclipse 2015

Background

A lunar eclipse occurs when the Moon passes within Earth's

umbra The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object of lesser size. In cases of equal or smaller impinging objects, only an umbra and penumba are generated. As ...

(shadow). As the eclipse begins, Earth's shadow first darkens the Moon slightly. Then, the shadow begins to "cover" part of the Moon, turning it a dark red-brown color (typically - the color can vary based on atmospheric conditions). The Moon appears to be reddish because of

Rayleigh scattering Rayleigh scattering ( ) is the scattering or deflection of light, or other electromagnetic radiation, by particles with a size much smaller than the wavelength of the radiation. For light frequencies well below the resonance frequency of the scat ...

(the same effect that causes sunsets to appear reddish) and the refraction of that light by Earth's atmosphere into its umbra. The following simulation shows the approximate appearance of the Moon passing through Earth's shadow. The Moon's brightness is exaggerated within the umbral shadow. The southern portion of the Moon will be closest to the center of the shadow, making it darkest, and most red in appearance.

Visibility

The eclipse was completely visible over

northeast Asia Northeast Asia or Northeastern Asia is a geographical Subregion#Asia, subregion of Asia. Its northeastern landmass and islands are bounded by the Pacific Ocean, North Pacific Ocean. The term Northeast Asia was popularized during the 1930s by Ame ...

, eastern

Australia Australia, officially the Commonwealth of Australia, is a country comprising mainland Australia, the mainland of the Australia (continent), Australian continent, the island of Tasmania and list of islands of Australia, numerous smaller isl ...

, the

Pacific Ocean The Pacific Ocean is the largest and deepest of Earth's five Borders of the oceans, oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean, or, depending on the definition, to Antarctica in the south, and is ...

, and western

North America North America is a continent in the Northern Hemisphere, Northern and Western Hemisphere, Western hemispheres. North America is bordered to the north by the Arctic Ocean, to the east by the Atlantic Ocean, to the southeast by South Ameri ...

, seen rising over

Asia Asia ( , ) is the largest continent in the world by both land area and population. It covers an area of more than 44 million square kilometres, about 30% of Earth's total land area and 8% of Earth's total surface area. The continent, which ...

and western Australia and setting over

North North is one of the four compass points or cardinal directions. It is the opposite of south and is perpendicular to east and west. ''North'' is a noun, adjective, or adverb indicating Direction (geometry), direction or geography. Etymology T ...

and

South America South America is a continent entirely in the Western Hemisphere and mostly in the Southern Hemisphere, with a considerably smaller portion in the Northern Hemisphere. It can also be described as the southern Subregion#Americas, subregion o ...

Timing

† The Moon was not visible during this part of the eclipse in this time zone.

Gallery

Blood moon full moon 1 (17006372266).jpg,

Toronto, Canada Toronto ( , locally pronounced or ) is the List of the largest municipalities in Canada by population, most populous city in Canada. It is the capital city of the Provinces and territories of Canada, Canadian province of Ontario. With a p ...

, 9:54 UTC Eclipse IMG 2484 (21723633221).jpg,

Auckland, New Zealand Auckland ( ; ) is a large metropolitan city in the North Island of New Zealand. It has an urban population of about It is located in the greater Auckland Region, the area governed by Auckland Council, which includes outlying rural areas and ...

, 9:54 UTC Partial Lunar Eclipse (17037101365).jpg,

Macon, Georgia Macon ( ), officially Macon–Bibb County, is a consolidated city-county in Georgia (U.S. state), Georgia, United States. Situated near the Atlantic Seaboard fall line, fall line of the Ocmulgee River, it is southeast of Atlanta and near the ...

, 10:54 UTC Lunar eclipse of 2015 April 4 from Mexico City.jpg,

Mexico City, Mexico Mexico City is the capital city, capital and List of cities in Mexico, largest city of Mexico, as well as the List of North American cities by population, most populous city in North America. It is one of the most important cultural and finan ...

, 10:59 UTC Lunar eclipse Apr04-2015-TLR2.png,

Minneapolis, Minnesota Minneapolis is a city in Hennepin County, Minnesota, United States, and its county seat. With a population of 429,954 as of the 2020 United States census, 2020 census, it is the state's List of cities in Minnesota, most populous city. Locat ...

, 11:09 UTC Partial Lunar Eclipse (17028424751).jpg,

Chicago, Illinois Chicago is the List of municipalities in Illinois, most populous city in the U.S. state of Illinois and in the Midwestern United States. With a population of 2,746,388, as of the 2020 United States census, 2020 census, it is the List of Unite ...

, 11:36 UTC Red moon (17029581355).jpg,

Melbourne, Australia Melbourne ( , ; Boonwurrung/ or ) is the capital and most populous city of the Australian state of Victoria, and the second most-populous city in Australia, after Sydney. The city's name generally refers to a metropolitan area also known ...

, 11:46 UTC Lunar Eclipse, 2015-04-04 (9) (16418355164).jpg,

Denver, Colorado Denver ( ) is a List of municipalities in Colorado#Consolidated city and county, consolidated city and county, the List of capitals in the United States, capital and List of municipalities in Colorado, most populous city of the U.S. state of ...

, 11:50 UTC April 4th's Lunar Eclipse (17032923825).jpg,

Tai Po Tai Po is an List of areas of Hong Kong, area in the New Territories of Hong Kong. It refers to the vicinity of the traditional market towns in the area presently known as Tai Po Old Market or Tai Po Kau Hui () (the original "Tai Po Mark ...

, Hong Kong, 12:01 UTC Lunar Eclipse April 2015.JPG,

Santa Clara County, California Santa Clara County, officially the County of Santa Clara, is the sixth-most populous county in the U.S. state of California, with a population of 1,936,259 as of the 2020 United States census, 2020 census. Santa Clara County and neighboring Sa ...

, 12:02 UTC Lunar eclipse (16822666267).jpg,

Las Vegas, Nevada Las Vegas, colloquially referred to as Vegas, is the most populous city in the U.S. state of Nevada and the county seat of Clark County. The Las Vegas Valley metropolitan area is the largest within the greater Mojave Desert, and second-l ...

, 12:03 UTC Lunar Eclipse 04-03-2015 (16859149379).jpg,

Rio Rancho, New Mexico Rio Rancho () is the largest and most populous city in Sandoval County, part of the expansive Albuquerque metropolitan area, in the U.S. state of New Mexico. A small portion of the city extends into northern Bernalillo County. It is the thi ...

, 12:13 UTC Lunar Eclipse 4 April 2015 bangkok.jpg,

Bangkok, Thailand Bangkok, officially known in Thai language, Thai as Krung Thep Maha Nakhon and colloquially as Krung Thep, is the capital and most populous city of Thailand. The city occupies in the Chao Phraya River delta in central Thailand and has an estim ...

, 12:37 UTC Hi again, Lunar. (16407602854).jpg,

Hirosaki, Aomori is a city located in western Aomori Prefecture, Japan. , the city had an estimated population of 163,639 in 71,044 households, and a population density of . The total area of the city is . Hirosaki developed as a castle town for the 100,000 ''k ...

, 12:56 UTC Lunar Eclipse 4th April 2015.JPG,

Pune, India Pune ( ; , ISO: ), previously spelled in English as Poona ( the official name until 1978), is a city in the state of Maharashtra in the Deccan plateau in Western India. It is the administrative headquarters of the Pune district, and of Pune ...

, 13:38 UTC

Eclipse details

Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.

Eclipse season

This eclipse is part of an

eclipse season An eclipse season is a period, roughly every six months, when eclipses occur. Eclipse seasons are the result of the axial parallelism of the Orbit of the Moon, Moon's orbital plane (orbital inclination, tilted five degrees to the ecliptic, Earth ...

, 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 A fortnight is a unit of time equal to 14 days (two weeks). The word derives from the Old English term , meaning "" (or "fourteen days", since the Anglo-Saxons counted by nights). Astronomy and tides In astronomy, a ''lunar fortnight'' is hal ...

Related eclipses

Eclipses in 2015

* A total solar eclipse on March 20. * A total lunar eclipse on April 4. * A partial solar eclipse on September 13. * A total lunar eclipse on September 28.

Metonic

* Preceded by: Lunar eclipse of June 15, 2011 * Followed by: Lunar eclipse of January 21, 2019

Tzolkinex

* Preceded by: Lunar eclipse of February 21, 2008 * Followed by: Lunar eclipse of May 16, 2022

Half-Saros

* Preceded by:

Solar eclipse of March 29, 2006 Solar may refer to: Astronomy * Of or relating to the Sun ** Solar telescope, a special purpose telescope used to observe the Sun ** A device that utilizes solar energy (e.g. "solar panels") ** Solar calendar, a calendar whose dates indicate t ...

* Followed by:

Solar eclipse of April 8, 2024 The solar eclipse of April 8, 2024, also known as the Great North American Eclipse, was a total solar eclipse visible across a band covering parts of North America, from Mexico to Canada and crossing the contiguous United States. A solar eclipse ...

Tritos

* Preceded by: Lunar eclipse of May 4, 2004 * Followed by: Lunar eclipse of March 3, 2026

Lunar Saros 132

* Preceded by: Lunar eclipse of March 24, 1997 * Followed by: Lunar eclipse of April 14, 2033

Inex

* Preceded by: Lunar eclipse of April 24, 1986 * Followed by: Lunar eclipse of March 13, 2044

Triad

* Preceded by: Lunar eclipse of June 3, 1928 * Followed by: Lunar eclipse of February 3, 2102

Lunar eclipses of 2013–2016

Saros 132

Tritos series

Inex series

Half-Saros cycle

A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, ''The half-saros'' This lunar eclipse is related to two total solar eclipses of solar saros 139.

Notes

External links

*
Hermit Eclipse: Total Lunar Eclipse: April 4, 2015

Mattastro.com Total Lunar Eclipse: April 4, 2015

APOD 2015 April 8 {{DEFAULTSORT:Lunar eclipse 2015-04 2015-04 2015 in science April 2015