April 2015 lunar eclipse
Total eclipse | |||||||||||||||||
Date | April 4, 2015 | ||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Gamma | 0.4460 | ||||||||||||||||
Magnitude | 1.0019 | ||||||||||||||||
Saros cycle | 132 (30 of 71) | ||||||||||||||||
Totality | 4 minutes, 43 seconds | ||||||||||||||||
Partiality | 209 minutes, 1 second | ||||||||||||||||
Penumbral | 357 minutes, 31 seconds | ||||||||||||||||
| |||||||||||||||||
A total lunar eclipse occurred at the Moon’s ascending node of orbit on Saturday, April 4, 2015,[1] with an umbral magnitude of 1.0019. A lunar eclipse occurs when the Moon moves into the Earth's shadow, 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, which can only be viewed from a relatively small area of the world, a lunar eclipse may be viewed from anywhere on the night 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 is smaller. Occurring about 3.1 days after apogee (on April 1, 2015, at 9:00 UTC), the Moon's apparent diameter was smaller.[2]
This lunar eclipse is the third of a tetrad, 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, and the first total eclipse of the series. The previous event was the March 1997 lunar eclipse, being slightly partial.
Duration
[edit]Totality lasted only 4 minutes and 43 seconds,[3] 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.[4] 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 apogee at 29.42'.
Background
[edit]A lunar eclipse occurs when the Moon passes within Earth's umbra (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 (the same effect that causes sunsets to appear reddish) and the refraction of that light by Earth's atmosphere into its umbra.[5]
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
[edit]The eclipse was completely visible over northeast Asia, eastern Australia, the Pacific Ocean, and western North America, seen rising over Asia and western Australia and setting over North and South America.[6]
Visibility map |
Timing
[edit]Time Zone adjustments from UTC |
+8h | +11h | +13h | -10h | -8h | -7h | -6h | -5h | -4h | ||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
AWST | AEDT | NZDT | HST | AKDT | PDT | MDT | CDT | EDT | |||||
Event | Evening April 4 | Morning April 4 | |||||||||||
P1 | Penumbral begins | N/A† | 8:01 pm | 10:01 pm | 11:01 pm | 1:01 am | 2:01 am | 3:01 am | 4:01 am | 5:01 am | |||
U1 | Partial begins | 6:16 pm | 9:16 pm | 11:16 pm | 12:16 am | 2:16 am | 3:16 am | 4:16 am | 5:16 am | 6:16 am | |||
U2 | Total begins | 7:58 pm | 10:58 pm | 12:58 am | 1:58 am | 3:58 am | 4:58 am | 5:58 am | 6:58 am | Set | |||
Greatest eclipse | 8:00 pm | 11:00 pm | 1:00 am | 2:00 am | 4:00 am | 5:00 am | 6:00 am | 7:00 am | Set | ||||
U3 | Total ends | 8:03 pm | 11:03 pm | 1:03 am | 2:03 am | 4:03 am | 5:03 am | 6:03 am | Set | Set | |||
U4 | Partial ends | 9:45 pm | 12:45 am | 2:45 am | 3:45 am | 5:45 am | Set | Set | Set | Set | |||
P4 | Penumbral ends | 10:59 pm | 1:59 am | 3:59 am | 3:59 am | 5:59 am | Set | Set | Set | Set |
† The Moon was not visible during this part of the eclipse in this time zone.
[7]
| The timing of total lunar eclipses are determined by its contacts:
Gallery
[edit]Progression from Bali, Indonesia | |
Time-lapsed image from Taiwan |
Sequence from Fox Observatory in Sunrise, Florida |
Sequence from Melbourne, Florida |
Progression from St. Louis, Missouri |
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Toronto, Canada, 9:54 UTC
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Auckland, New Zealand, 9:54 UTC
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Macon, Georgia, 10:54 UTC
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Mexico City, Mexico, 10:59 UTC
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Minneapolis, Minnesota, 11:09 UTC
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Chicago, Illinois, 11:36 UTC
-
Melbourne, Australia, 11:46 UTC
-
Denver, Colorado, 11:50 UTC
-
Tai Po, Hong Kong, 12:01 UTC
-
Santa Clara County, California, 12:02 UTC
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Las Vegas, Nevada, 12:03 UTC
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Rio Rancho, New Mexico, 12:13 UTC
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Bangkok, Thailand, 12:37 UTC
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Hirosaki, Aomori, 12:56 UTC
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Pune, India, 13:38 UTC
Eclipse details
[edit]Shown below is a table displaying details about this particular solar eclipse. It describes various parameters pertaining to this eclipse.[8]
Parameter | Value |
---|---|
Penumbral Magnitude | 2.08024 |
Umbral Magnitude | 1.00191 |
Gamma | 0.44599 |
Sun Right Ascension | 00h53m01.2s |
Sun Declination | +05°40'32.8" |
Sun Semi-Diameter | 15'59.6" |
Sun Equatorial Horizontal Parallax | 08.8" |
Moon Right Ascension | 12h53m29.7s |
Moon Declination | -05°17'20.2" |
Moon Semi-Diameter | 14'49.9" |
Moon Equatorial Horizontal Parallax | 0°54'25.9" |
ΔT | 67.7 s |
Eclipse season
[edit]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.
March 20 Descending node (new moon) |
April 4 Ascending node (full moon) |
---|---|
Total solar eclipse Solar Saros 120 |
Total lunar eclipse Lunar Saros 132 |
Related eclipses
[edit]Eclipses in 2015
[edit]- 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
[edit]- Preceded by: Lunar eclipse of June 15, 2011
- Followed by: Lunar eclipse of January 21, 2019
Tzolkinex
[edit]- Preceded by: Lunar eclipse of February 21, 2008
- Followed by: Lunar eclipse of May 16, 2022
Half-Saros
[edit]- Preceded by: Solar eclipse of March 29, 2006
- Followed by: Solar eclipse of April 8, 2024
Tritos
[edit]- Preceded by: Lunar eclipse of May 4, 2004
- Followed by: Lunar eclipse of March 3, 2026
Lunar Saros 132
[edit]- Preceded by: Lunar eclipse of March 24, 1997
- Followed by: Lunar eclipse of April 14, 2033
Inex
[edit]- Preceded by: Lunar eclipse of April 24, 1986
- Followed by: Lunar eclipse of March 13, 2044
Triad
[edit]- Preceded by: Lunar eclipse of June 3, 1928
- Followed by: Lunar eclipse of February 3, 2102
Lunar eclipses of 2013–2016
[edit]The eclipse is the one of four lunar eclipses in a short-lived series at the ascending node of the Moon's orbit.
The lunar year series repeats after 12 lunations, or 354 days (shifting back about 10 days in sequential years). Because of the date shift, the Earth's shadow will be about 11 degrees west in sequential events.
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 |
Partial |
−1.0121 | 117 |
2013 Oct 18 |
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 |
Total |
−0.3296 | |
142 | 2016 Mar 23 |
Penumbral |
1.1592 | 147 |
2016 Sep 16 |
Penumbral |
−1.0549 | |
Last set | 2013 May 25 | Last set | 2012 Nov 28 | |||||
Next set | 2017 Feb 11 | Next set | 2016 Aug 18 |
Saros 132
[edit]Lunar saros series 132, repeating every 18 years and 11 days, has a total of 71 lunar eclipse events including 44 umbral lunar eclipses (32 partial lunar eclipses and 12 total lunar eclipses).
Greatest | First | |||
---|---|---|---|---|
The greatest eclipse of the series will occur on 2123 Jun 9, lasting 106 minutes.[9] |
Penumbral | Partial | Total | Central |
1492 May 12 |
1636 Aug 16 |
2015 Apr 4 |
2069 May 6 | |
Last | ||||
Central | Total | Partial | Penumbral | |
2177 Jul 11 |
2213 Aug 2 |
2429 Dec 11 |
2754 Jun 26 |
There are 11 series events between 1901 and 2100, grouped into threes (called an exeligmos), each column with approximately the same viewing longitude on earth.
1907 Jan 29 | 1925 Feb 8 | 1943 Feb 20 | |||
1961 Mar 2 | 1979 Mar 13 | 1997 Mar 24 | |||
2015 Apr 4 | 2033 Apr 14 | 2051 Apr 26 | |||
2069 May 6 | 2087 May 17 | ||||
Half-Saros cycle
[edit]A lunar eclipse will be preceded and followed by solar eclipses by 9 years and 5.5 days (a half saros).[10] This lunar eclipse is related to two total solar eclipses of solar saros 139.
March 29, 2006 | April 8, 2024 |
---|---|
See also
[edit]Notes
[edit]- ^ "April 4, 2015 Total Lunar Eclipse (Blood Moon)". timeanddate. Retrieved 16 November 2024.
- ^ "Moon Distances for London, United Kingdom, England". timeanddate. Retrieved 16 November 2024.
- ^ Espenak, Fred. "Total Lunar Eclipse of 2015 Apr 04" (PDF). NASA's GSFC.
- ^ "The Lunar Eclipse Wasn't Total After All?!". Sky & Telescope. 6 April 2015.
- ^ Fred Espenak and Jean Meeus. "Visual Appearance of Lunar Eclipses". NASA. Retrieved 13 April 2014.
- ^ "Total Lunar Eclipse of 2015 Apr 04" (PDF). NASA. Retrieved 16 November 2024.
- ^ Clarke, Kevin. "On the nature of eclipses". Inconstant Moon. Cyclopedia Selenica. Retrieved 19 December 2010.
- ^ "Total Lunar Eclipse of 2015 Apr 04". EclipseWise.com. Retrieved 16 November 2024.
- ^ Listing of Eclipses of series 132
- ^ Mathematical Astronomy Morsels, Jean Meeus, p.110, Chapter 18, The half-saros
External links
[edit]- 2015 Apr 04 chart: Eclipse Predictions by Fred Espenak, NASA/GSFC
- Hermit Eclipse: Total Lunar Eclipse: April 4, 2015
- Mattastro.com Total Lunar Eclipse: April 4, 2015
- Full Moon in Earth's Shadow APOD 2015 April 8