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September 2015 lunar eclipse

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September 2015 lunar eclipse

Total lunar eclipse
September 28, 2015

The moon passes right to left through the Earth's shadow
Gamma -0.3296
Duration (hr:mn:sc)
Totality 1:11:55
Partial 3:19:52
Penumbral 5:10:41
Contacts (UTC)
P1 0:11:47
U1 1:07:11
U2 2:11:10
Greatest 2:47:07
U3 3:23:05
U4 4:27:03
P4 5:22:27

A total lunar eclipse will take place on September 28, 2015. It is the latter of two total lunar eclipses in 2015, and the final in a tetrad (four total lunar eclipses in series). Other eclipses in the tetrad are those of April 15, 2014, October 8, 2014, and April 4, 2015. This lunar eclipse will be particularly rare, because it is a harvest moon lunar eclipse, taking place also on the day of the closest supermoon of 2015.

Contents

  • Visibility 1
  • Background 2
  • Timing 3
  • Related eclipses 4
  • See also 5
  • References 6
  • External links 7

Visibility

The eclipse will be visible over Europe, the Middle East, Africa, and the Americas.


View of earth from moon

Simulated appearance of earth and atmospheric ring of sunlight

Background

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.[1]

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.

Timing

Local times of contacts
Timezone
adjustments from
UTC
-7h -6h -5h -4h -3h -2h -1h 0h
PDT MDT CDT
PET
EDT
BOT
ADT
AMST
ART
GMT
Event Evening September 27 Morning Sept. 28
P1 Penumbral begins* 5:12 pm 6:12 pm 7:12 pm 8:12 pm 9:12 pm 10:12 pm 11:12 pm 12:12 am
U1 Partial begins 6:07 pm 7:07 pm 8:07 pm 9:07 pm 10:07 pm 11:07 pm 12:07 am 1:07 am
U2 Total begins 7:11 pm 8:11 pm 9:11 pm 10:11 pm 11:11 pm 12:11 am 1:11 am 2:11 am
Mid-eclipse 7:47 pm 8:47 pm 9:47 pm 10:47 pm 11:47 pm 12:47 am 1:47 am 2:47 am
U3 Total ends 8:23 pm 9:23 pm 10:23 pm 11:23 pm 12:23 am 1:23 am 2:23 am 3:23 am
U4 Partial ends 9:27 pm 10:27 pm 11:27 pm 12:27 am 1:27 am 2:27 am 3:27 am 4:27 am
P4 Penumbral ends 10:22 pm 11:22 pm 12:22 am 1:22 am 2:22 am 3:22 am 4:22 am 5:22 am

* The penumbral phase of the eclipse changes the appearance of the Moon only slightly and is generally not noticeable.[2]

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. 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.


Related eclipses

The eclipse is the one of four lunar eclipses in a short-lived series at the descending 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 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 08

See also

References

  1. ^ Fred Espenak and Jean Meeus. "Visual Appearance of Lunar Eclipses". NASA. Retrieved April 13, 2014. 
  2. ^ Espenak, Fred. "Lunar Eclipses for Beginners". MrEclipse. Retrieved April 7, 2014. 
  3. ^ Clarke, Kevin. "On the nature of eclipses". Inconstant Moon. Cyclopedia Selenica. Retrieved 19 December 2010. 

External links


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