Sky and Telescope - January 2016 - 23

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MICHAEL ZEILER / GREATAMERICANECLIPSE.COM

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Eclipse ends at su
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miles before it reaches Oregon's rugged coast. It'll be
10:16 a.m. PDT as the 62-mile-wide shadow track makes
landfall at Lincoln Beach, with the midmorning Sun
already 39° above the horizon. However, while Oregon's
beaches will be ﬁrst to experience the Moon's shadow,
this fogbound coastline and the cold ocean current just
oﬀshore are not optimal for eclipse watching.
Rushing inland with a ground speed of 2,400 miles per
hour, the Moon's umbra crosses the 3,000-foot-high Coast
Range and enters the Willamette Valley. Salem, Oregon's
capital, lies 9 miles north of the track's central line and
enjoys totality for 1m 55s. The neighboring cities of Albany
(1m 51s) and Corvallis (1m 40s) are also deep in the path.
The Coast Range forces moist Paciﬁc air upward to
cool and condense into clouds. But the 3,000-foot elevation of these peaks is only partially successful at removing the moisture. It takes the much higher Cascade
Range, on the east side of the Willamette Valley, to do
that. Salem is representative of valley weather with an
average cloud amount of 46%.
The shadow scales the 10,000-foot peaks of the
Cascade Range before entering the Columbia Plateau
- an open plain of farms and dry grasses. The town
of Madras (population: 6,400) lies 5 miles south of the
centerline, where totality lasts 2m 3s. Ontario, Oregon,
lies 8 miles north of the southern limit but is still deep
enough in the path to witness 1½ minutes of totality.
After traversing all of Oregon in just 9 minutes,
the umbra enters Idaho. Boise, its capital, lies 15 miles
outside the path's southern limit. Although Boiseans
only get to see a partial eclipse, it's an incredibly deep

17:00 U

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TRANSCONTINENTAL EXPRESS Above: The 8,600-mile-long track of the
August 21, 2017, total solar eclipse begins at sunrise in the Paciﬁc Ocean and
ends at sunset in the Atlantic. About 30%
% of the path crosses the contiguous
United States - the ﬁrst time that's happened since 1918. Top: Averaging
about 68 miles wide, the Moon's umbral shadow will cover about 5%
% of the
area of the contiguous U.S. as it crosses or clips 12 states. Hundreds of millions of Americans will be within a 1- or 2-day drive of totality's path.
S&T ILLUSTRATION, SOURCE: FRED ESPENAK

Sk yandTelescope.com Januar y 2016

23
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Sky and Telescope - January 2016

Table of Contents for the Digital Edition of Sky and Telescope - January 2016
