The Yuletide evening sky is especially rewarding now.
The eastern sky is filled with brilliant stars — sort of a celestial Christmas tree. Distinctive groupings offorming part of the recognized constellation outlines, or lying within their boundaries, are known as asterisms.
One of the most famous is in the northwest these frosty evenings. Originally known simply as the"Bird" in ancient times, without any indication of what sort of bird it was supposed to represent, it later became the constellation. But the brightest six stars of Cygnus compose an asterism more popularly called the Northern Cross.
Bright Deneb decorates the top of the Cross. Albereo, at the foot of the Cross, is really a pair of stars of beautifully contrasting colors: a third magnitude orange star and its fifth magnitude blue companion are clearly visible in even a low power telescope. While usually regarded as a summertime pattern, the Cross is best oriented for viewing now, appearing to stand majestically upright on the northwest horizon at around 8:30 p.m. local time, forming a most appropriate Christmas symbol.
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