Sky and Telescope - February 2017 - 49

When and Where

Penumbral Eclipse of the Moon, February 10, 2017
Eclipse event

EST

CST

MST

PST

Penumbra first visible?

6:14 p.m.

5:14 p.m.

-

-

Mid-eclipse

7:44 p.m.

6:44 p.m.

5:44 p.m.

-

Penumbra last visible?

9:14 p.m.

8:14 p.m.

7:14 p.m.

6:14 p.m.

North

BRA

A
P

EN

U

M

Mideclipse
0:44 UT

UM

BR

East
Moon
leaves
penumbra
2:55 UT
(unobservable)

Moon enters
penumbra
22:32 UT
(unobservable)

's
Moon
h
t
pa

South

that means about 90 minutes before
mid-eclipse (which will come at 0:44
February 11th UT). The Moon's celestial
northeastern side, where the shading
will begin, is its left side as seen in early

A Far-Southern Annular Eclipse

0

UT

:0

15

UT

0

:3

UT

evening from mid-northern latitudes.
In North America, only the northeastern U.S. and eastern Canada will
have the Moon well up in time to watch
for this beginning. A lot will depend on
how uniform any thin cloudiness may
be, and on how much time and care
you take to judge the reality of subtle
impressions.
The passing minutes will gradually
confirm your first correct judgments.
By the time mid-eclipse approaches, the
lopsidedness of the Moon's illumination will be totally obvious. The shading
will appear to become ever more sharply
concentrated toward the northern
limb, because an umbra drops off
in brightness most sharply near its
inner edge.
And then, as the Moon rises
higher and any last twilight fades
down, the process reverses. This is
the part of the eclipse most Americans will be able to see best. How long
can you hold a trace of shading with
your eyes, and with a telescope? Will 90
minutes after mid-eclipse really be the
last time anything is visible?
For a world map of visibility and
more information about this event, see
https://is.gd/penumbraleclipse2017.

Eclipse begins at s
uns
et
Maximum eclipse at sun
set

UT

T

0U

00

UT

s at sunset
Eclipse end

UT

:00
15

:3
14

14:

ise
sunr rise
at
un
t s
ds
se
en se a
n ri
p
e
t su
li
s
sa
ec
ip
n
l
i
g
c m
be
u
se
im
ax clip
E
M

0

16

:3

16

On February 26th, a very thin annular
eclipse of the Sun will cross parts of
southern Chile and Argentina, the
se
South Atlantic, Angola, and, at
clip
le
a
i
rt
sunset, the Zambia-Congo
pa
of
border. A partial eclipse will
it
lim %
n
grace much larger sec20
er
h
rt
%
40
No
tions of South America,
SE
LIP
%
60
EC
Africa, and Antarctica.
%
AR
80
UL
At any location, interN
AN
polate between the red
OF
%
80
TH
lines to find the Universal
PA
%
60
Time of greatest eclipse.
%
Interpolate between the
40
blue lines to see what per20%
cent of the Sun's diameter
the Moon will cover at that
time. For detailed maps and further information, see https://is.gd/
annulareclipse2017.
13:30
E

S&T: LE AH TISCIONE (2)

Penumbral Eclipse
Feb. 10 -11, 2017
West

Eastern North America, and all of Central and South America, will have a fine
view of these shadowy happenings. In
these locations twilight will be deepening or entirely over, and the full Moon
will be shining well up in the eastern
sky, by the time of maximum shading.
Northeasterners can watch the whole
progression from start to finish. Seen
from the central part of North America,
the eclipse will already be at maximum
around or soon after moonrise and sunset, with the Moon still low in a bright
eastern sky. For the West, the Moon
rises and the Sun sets after the eclipse
has passed its peak. But even here
you may be able to witness the subtle
anomaly on the Moon fading away.
Europe, Africa, and western Asia
have a trouble-free view, with the Moon
high in a dark sky during the early
morning hours of February 11th.
The outer part of Earth's penumbra,
like the outer part of any penumbra,
is so pale that you can't detect it. You
won't see anything happening until
the Moon's edge is at least halfway
across the penumbra. For this event,

s k y a n d t e l e s c o p e .c o m

* FEBRUARY 2017

49


https://www.is.gd/annulareclipse2017 https://www.is.gd/annulareclipse2017 https://www.is.gd/penumbraleclipse2017 http://www.skyandtelescope.com

Sky and Telescope - February 2017

Table of Contents for the Digital Edition of Sky and Telescope - February 2017

Contents
Sky and Telescope - February 2017 - Cover1
Sky and Telescope - February 2017 - Cover2
Sky and Telescope - February 2017 - 1
Sky and Telescope - February 2017 - Contents
Sky and Telescope - February 2017 - 3
Sky and Telescope - February 2017 - 4
Sky and Telescope - February 2017 - 5
Sky and Telescope - February 2017 - 6
Sky and Telescope - February 2017 - 7
Sky and Telescope - February 2017 - 8
Sky and Telescope - February 2017 - 9
Sky and Telescope - February 2017 - 10
Sky and Telescope - February 2017 - 11
Sky and Telescope - February 2017 - 12
Sky and Telescope - February 2017 - 13
Sky and Telescope - February 2017 - 14
Sky and Telescope - February 2017 - 15
Sky and Telescope - February 2017 - 16
Sky and Telescope - February 2017 - 17
Sky and Telescope - February 2017 - 18
Sky and Telescope - February 2017 - 19
Sky and Telescope - February 2017 - 20
Sky and Telescope - February 2017 - 21
Sky and Telescope - February 2017 - 22
Sky and Telescope - February 2017 - 23
Sky and Telescope - February 2017 - 24
Sky and Telescope - February 2017 - 25
Sky and Telescope - February 2017 - 26
Sky and Telescope - February 2017 - 27
Sky and Telescope - February 2017 - 28
Sky and Telescope - February 2017 - 29
Sky and Telescope - February 2017 - 30
Sky and Telescope - February 2017 - 31
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Sky and Telescope - February 2017 - 33
Sky and Telescope - February 2017 - 34
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Sky and Telescope - February 2017 - 37
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Sky and Telescope - February 2017 - 41
Sky and Telescope - February 2017 - 42
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Sky and Telescope - February 2017 - 49
Sky and Telescope - February 2017 - 50
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Sky and Telescope - February 2017 - 84
Sky and Telescope - February 2017 - Cover3
Sky and Telescope - February 2017 - Cover4
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