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Summer Triangle
The
Summer Triangle
is an
astronomical
asterism
involving an
imaginary
triangle
drawn
, during the
summer
, upon the
northern hemisphere
's
celestial sphere
; with its defining
vertices
at
Altair
,
Deneb
, and
Vega
. This triangle connects the
constellations
of
Aquila
,
Cygnus
, and
Lyra
.
See also:
Winter Triangle
Chinese Valentine's Day
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