Skywatch - 2021 - 50
NOV EM BER | 2021
W
e've mentioned the ecliptic
several times already in
these pages. The ecliptic
was so named because for a lunar or
solar eclipse to occur, the Moon has
to pass through this plane. The word
eclipse itself fi rst appeared around
AD 1280 and has its roots in the Greek
ékleipsis, which means "a leaving out."
Ecliptic can be traced back to AD 1391
when it appeared in Geoffrey Chaucer's
50 SK Y WATCH 2021
When Things
Go Dark
Eclipses, both solar and lunar, are spectacular events.
instruction manual Treatise on the Astrolabe
as "ecliptik lyne."
If you live on the West Coast of North
America, perhaps you saw the lunar eclipse
back in May. Where's the full Moon symbol on the chart on page 29? Centered
right on the ecliptic for May 25th (the date
of the evening closest to the full Moon).
Notice where the other Moon symbols are?
A ways off the ecliptic. The Moon's orbital
plane is tilted by some 5° to the ecliptic -
consequently, the Moon spends most of
its time either above or below the ecliptic. It's only when a full Moon crosses
the ecliptic that eclipses occur.
The Sun blotted out from the
sky. Solar eclipses are probably the
most astounding celestial event that
the human species can experience
(except, perhaps, for a supernova
explosion . . . at a safe distance). Serendipitously, the apparent sizes of
SEAN WALKER
Viewers in North America
can enjoy a lunar eclipse
on the night of November
18-19. This photomontage shows various stages
of the eclipse as the Moon
dives deep into Earth's
shadow, is fully eclipsed,
and then reemerges.
Skywatch - 2021
Table of Contents for the Digital Edition of Skywatch - 2021
Contents
Skywatch - 2021 - Cover1
Skywatch - 2021 - Cover2
Skywatch - 2021 - 1
Skywatch - 2021 - Contents
Skywatch - 2021 - 3
Skywatch - 2021 - 4
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