Sky & Telescope - January 2025 - 27

ECLIPSE EVOLUTION From first
contact to last, most total eclipses
take about two hours to unfold completely.
However, the most exciting
phase by far is totality - the alwaystoo-brief
moments when the Moon
completely covers the Sun. Eclipse
chasers travel the world to experience
the wonder and excitement of
standing in the Moon's shadow. The
coming decade offers eight opportunities
to take in totality.
appears slightly larger than that of the Sun and blots out
the blindingly bright solar photosphere, revealing crimson
prominences and the feathery, ethereal corona. But
because the Moon's orbit around Earth is elliptical, the
apparent size of the lunar disk varies by as much as 14%.
At times the Moon may be too far away and, therefore,
appear too small to completely hide the Sun. On those
occasions, we get annular eclipses, a name derived from
the Latin annularis ( " ring-shaped " ) for the thin ring of
sunlight that remains at mid-eclipse.
Partial Solar Eclipses 2025 - 2035
Date
March 29, 2025
September 21, 2025
January 14, 2029
June 12, 2029
July 11, 2029
December 5, 2029
November 3, 2032
September 23, 2033
Magnitude*
0.938
0.855
0.871
0.458
0.230
0.891
0.855
0.689
Area of Visibility
Northeastern North America, most of Europe, northwestern Africa, northwestern Russia
Coastal plain of New South Wales, Australia, New Zealand, Antarctica
North America (except most of Alaska, and Northwest Canada), southern Greenland
Arctic, Scandinavia, northern Russia, Alaska, northwestern Canada
Southern portions of Chile and Argentina and Graham Land, Antarctica
Southernmost Chile and Argentina, Antarctica
Most of Asia
Southern third of South America, Antarctica
*Magnitude indicates the fraction of the Sun's diameter that the Moon obstructs.
The Moon's umbral shadow is surrounded by a vast
outer shadow called the penumbra. Observers positioned
within the penumbra see the Sun only partially obscured
- the nearer you are to the umbra, the greater the portion
of the solar disk that the passing Moon covers. If
you're not on the centerline during a total eclipse, you'll
experience a partial solar eclipse. However, when the
Moon's path doesn't take it across the center of the Sun,
only the penumbral shadow reaches Earth. As a result, we
witness an eclipse that's exclusively partial.
sk yand tele scope .o r g * JANUARY 2025 27

http://skyandtelescope.org

Sky & Telescope - January 2025

Table of Contents for the Digital Edition of Sky & Telescope - January 2025

Contents
Sky & Telescope - January 2025 - Cover1
Sky & Telescope - January 2025 - Cover2
Sky & Telescope - January 2025 - 1
Sky & Telescope - January 2025 - Contents
Sky & Telescope - January 2025 - 3
Sky & Telescope - January 2025 - 4
Sky & Telescope - January 2025 - 5
Sky & Telescope - January 2025 - 6
Sky & Telescope - January 2025 - 7
Sky & Telescope - January 2025 - 8
Sky & Telescope - January 2025 - 9
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Sky & Telescope - January 2025 - 11
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Sky & Telescope - January 2025 - 14
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Sky & Telescope - January 2025 - 25
Sky & Telescope - January 2025 - 26
Sky & Telescope - January 2025 - 27
Sky & Telescope - January 2025 - 28
Sky & Telescope - January 2025 - 29
Sky & Telescope - January 2025 - 30
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Sky & Telescope - January 2025 - Cover3
Sky & Telescope - January 2025 - Cover4
Sky & Telescope - January 2025 - SGA1
Sky & Telescope - January 2025 - SGA2
Sky & Telescope - January 2025 - SGA3
Sky & Telescope - January 2025 - SGA4
Sky & Telescope - January 2025 - SGA5
Sky & Telescope - January 2025 - SGA6
Sky & Telescope - January 2025 - SGA7
Sky & Telescope - January 2025 - SGA8
Sky & Telescope - January 2025 - SGA9
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