Sky and Telescope - January 2018 - 48

JANUARY 2018 OBSERVING
Celestial Calendar by S. N. Johnson-Roehr

January's Total Lunar Eclipse
The Western United States, including Alaska and Hawai'i, has the best view.

taken during the last
total lunar eclipse
on September 28,
2015, was captured
in seven separate
exposures with a
Canon Rebel XSi
DSLR and an 8-inch
f/3.3 Newtonian
reflector.

MORE ECLIPSE PHOTOS
Visit our online gallery
to see more spectacular
images of lunar eclipses:
https://is.gd/STLunar.

48

JA N UA RY 2 018 * SK Y & TELESCOPE

O

n Wednesday, January 31, 2018, the
ﬁrst total lunar eclipse in more than
two years graces the skies above North
America. But unlike the previous one, this
eclipse is positioned perfectly for the West
Coast and Paciﬁc Rim, while the East Coast
and the Atlantic Regions will see little, if
any, of the show.
The eclipse occurs in the morning for
western North America and the near
Paciﬁc. For the East Coast, the Moon sets
before totality arrives, so the best you'll see
from, say, Pittsburgh, is a partial eclipse.
Viewers in the western contiguous United
States (roughly west of a line drawn from
Grand Forks, North Dakota, to El Paso,
Texas) will have good views of most of the
action, with the Moon setting at the end
of or soon after totality. The farther west/
northwest the viewer, the better the event.
Los Angeles sees the end of totality in a
brightening sky; the Moon sets before the
second partial stage is complete. More
northwesterly Seattle sees almost the entire

eclipse, missing only the subtle end stage.
Honolulu and Anchorage see every stage in
an enjoyably dark sky. Alaska, Yukon, most
of British Columbia, the Northwest Territories, parts of Nunavut, and Hawai'i see the
eclipse from start to ﬁnish.
Totality falls on the evening of January
31st for eastern Asia and the far Paciﬁc.
China, Mongolia, Japan, Korea, Russia,
New Zealand, the Philippines, and most of
Indonesia and Australia will see the eclipse
in its entirety. (Perth, you miss the opening
minutes of the event, but this is no big deal
as the subtle shadow in the early stages of a
total eclipse isn't visible to the naked eye.)
The map and diagram with timetable
on the facing page will give you an idea of
what to expect at your location.

Stages of the Eclipse
There are ﬁve stages of a total lunar eclipse.
The ﬁrst stage begins the moment the
Moon's leading edge slips into the penumbra. Because the Sun isn't a point source, the

SE AN WA LK ER

This sequence

https://www.is.gd/STLunar

Sky and Telescope - January 2018

Table of Contents for the Digital Edition of Sky and Telescope - January 2018

Contents
Sky and Telescope - January 2018 - Cover1
Sky and Telescope - January 2018 - Cover2
Sky and Telescope - January 2018 - 1
Sky and Telescope - January 2018 - Contents
Sky and Telescope - January 2018 - 3
Sky and Telescope - January 2018 - 4
Sky and Telescope - January 2018 - 5
Sky and Telescope - January 2018 - 6
Sky and Telescope - January 2018 - 7
Sky and Telescope - January 2018 - 8
Sky and Telescope - January 2018 - 9
Sky and Telescope - January 2018 - 10
Sky and Telescope - January 2018 - 11
Sky and Telescope - January 2018 - 12
Sky and Telescope - January 2018 - 13
Sky and Telescope - January 2018 - 14
Sky and Telescope - January 2018 - 15
Sky and Telescope - January 2018 - 16
Sky and Telescope - January 2018 - 17
Sky and Telescope - January 2018 - 18
Sky and Telescope - January 2018 - 19
Sky and Telescope - January 2018 - 20
Sky and Telescope - January 2018 - 21
Sky and Telescope - January 2018 - 22
Sky and Telescope - January 2018 - 23
Sky and Telescope - January 2018 - 24
Sky and Telescope - January 2018 - 25
Sky and Telescope - January 2018 - 26
Sky and Telescope - January 2018 - 27
Sky and Telescope - January 2018 - 28
Sky and Telescope - January 2018 - 29
Sky and Telescope - January 2018 - 30
Sky and Telescope - January 2018 - 31
Sky and Telescope - January 2018 - 32
Sky and Telescope - January 2018 - 33
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Sky and Telescope - January 2018 - 35
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Sky and Telescope - January 2018 - 37
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Sky and Telescope - January 2018 - 40
Sky and Telescope - January 2018 - 41
Sky and Telescope - January 2018 - 42
Sky and Telescope - January 2018 - 43
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Sky and Telescope - January 2018 - 45
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Sky and Telescope - January 2018 - 47
Sky and Telescope - January 2018 - 48
Sky and Telescope - January 2018 - 49
Sky and Telescope - January 2018 - 50
Sky and Telescope - January 2018 - 51
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Sky and Telescope - January 2018 - 53
Sky and Telescope - January 2018 - 54
Sky and Telescope - January 2018 - 55
Sky and Telescope - January 2018 - 56
Sky and Telescope - January 2018 - 57
Sky and Telescope - January 2018 - 58
Sky and Telescope - January 2018 - 59
Sky and Telescope - January 2018 - 60
Sky and Telescope - January 2018 - 61
Sky and Telescope - January 2018 - 62
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Sky and Telescope - January 2018 - 81
Sky and Telescope - January 2018 - 82
Sky and Telescope - January 2018 - 83
Sky and Telescope - January 2018 - 84
Sky and Telescope - January 2018 - Cover3
Sky and Telescope - January 2018 - Cover4
Sky and Telescope - January 2018 - SGA18SAL
Sky and Telescope - January 2018 - 90
Sky and Telescope - January 2018 - SGA18S
Sky and Telescope - January 2018 - SGA18SA
Sky and Telescope - January 2018 - SGA18EAL
Sky and Telescope - January 2018 - 94
Sky and Telescope - January 2018 - SGA18E
Sky and Telescope - January 2018 - SGA18EA
Sky and Telescope - January 2018 - SGA18RAL
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Sky and Telescope - January 2018 - SGA18R
Sky and Telescope - January 2018 - SGA18RA
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