Midwinter Triangle: Sirius, Procyon, Canis Minor
This is a news story, published by Space, that relates primarily to Canis Major news.
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Science
The Winter Triangle meets the 'Mars Triangle' in the night sky this month
71% Informative
This week , we have what many refer to as the "Winter Triangle " dominating the southeast sky.
This large, nearly equilateral triangle is composed of three of the brightest stars in the sky.
The brightest is the bluish-white star Sirius (magnitude -1.45), in Canis Major the Big Dog; the brightest of all naked-eye stars.
Since Dec. 7 , Mars has been undergoing a retrograde (backward) motion and has shifted westward.
By April 9, Mars will have receded to a distance of 113 million miles ( 182 million km ) from Earth .
It will have dimmed down to magnitude +0.6; that would rank it as third in brightness among the stars, only behind Sirius and Canopus .
This backward motion began to manifest itself after Mars arrived at its first stationary point on Dec. 7 .
On Feb. 24 , the combined movements of Earth and Mars will cancel-out the apparent backward motion, with Mars reaching a second stationary point.
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