April 2015 lunar eclipse
|Total lunar eclipse
April 4, 2015
The moon passes right to left through the Earth's shadow
A total lunar eclipse will take place on 4 April 2015. It is the former of two total lunar eclipses in 2015, and the third in a tetrad (four total lunar eclipses in series). Other eclipses in the tetrad are those of April 15, 2014, October 8, 2014, and September 28, 2015.
Totality will last only 4 minutes and 43 seconds.
The eclipse will be visible over western North America, the Pacific, east Asia, Australia and New Zealand.
A lunar eclipse occurs when the Moon passes within Earth's umbra (shadow). As the eclipse begins, the 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 the Earth's atmosphere into its umbra.
The following simulation shows the approximate appearance of the Moon passing through the earth's shadow. The Moon's brightness is exaggerated within the umbral shadow. The northern portion of the Moon was closest to the center of the shadow, making it darkest, and most red in appearance.
|Event||Evening April 4||Morning April 4|
|P1||Penumbral begins||5:01 pm||8:01 pm||10:01 pm||12:01 am||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||1:16 am||2:16 am||3:16 am||4:16 am||5:16 am||6:16 am|
|U2||Total begins||7:58 pm||9:58 pm||12:58 am||2:58 am||3:58 am||4:58 am||5:58 am||Set||Set|
|Greatest eclipse||8:00 pm||11:00 pm||1:00 am||3:00 am||4:00 am||5:00 am||6:00 am||Set||Set|
|U3||Total ends||8:03 pm||11:03 pm||1:03 am||3:03 am||4:03 am||5:03 am||6:03 am||Set||Set|
|U4||Partial ends||9:45 pm||12:45 am||2:45 am||4:45 am||5:45 am||6:45 am||Set||Set||Set|
|P4||Penumbral ends||10:59 pm||1:59 am||3:59 am||5:59 am||6:59 am||Set||Set||Set||Set|
The timing of total lunar eclipses are determined by its contacts:
- P1 (First contact): Beginning of the penumbral eclipse. The Earth's penumbra touches the Moon's outer limb.
- U1 (Second contact): Beginning of the partial eclipse. The Earth's umbra touches the Moon's outer limb.
- U2 (Third contact): Beginning of the total eclipse. The Moon's surface is entirely within the Earth's umbra.
- Greatest eclipse: The peak stage of the total eclipse. The Moon is at its closest to the center of the Earth's umbra.
- U3 (Fourth contact): End of the total eclipse. The Moon's outer limb exits the Earth's umbra.
- U4 (Fifth contact): End of the partial eclipse. The Earth's umbra leaves the Moon's surface.
- P4 (Sixth contact): End of the penumbral eclipse. The Earth's penumbra no longer makes contact with the Moon.
Lunar year series
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.
|Ascending node||Descending node|
||2013 Apr 25
||2013 Oct 18
||2014 Apr 15
||2014 Oct 08
|132||2015 Apr 04
||137||2015 Sep 28
|142||2016 Mar 23
||147||2016 Sep 16
|Last set||2013 May 25||Last set||2012 Nov 28|
|Next set||2017 Feb 11||Next set||2016 Aug 08|
Lunar saros series 132, repeating every 18 years and 11 days, has a total of 71 lunar eclipse events including 12 total lunar eclipses.
The greatest eclipse of the series on 2123 Jun 9 will last 106 minutes.
|1492 May 12
||1636 Aug 16
||2015 Apr 4
||2069 May 6
|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|
- Fred Espenak and Jean Meeus. "Visual Appearance of Lunar Eclipses". NASA. Retrieved April 13, 2014.
- Clarke, Kevin. "On the nature of eclipses". Inconstant Moon. Cyclopedia Selenica. Retrieved 19 December 2010.
- Listing of Eclipses of series 132
|Wikimedia Commons has media related to Lunar eclipse of 2015 April 4.|
- 2015 Apr 04 chart: Eclipse Predictions by Fred Espenak, NASA/GSFC
- Hermit Eclipse: Total Lunar Eclipse: April 4, 2015
|This Lunar eclipse-related article is a stub. You can help Wikipedia by expanding it.|