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| the Dog Star, the brightest-appearing star in the heavens, located in the constellation Canis Major |
| the fainter of the two stars that constitute a double or binary star |
| transit instrument | |
| —n | |
| an astronomical instrument, mounted on an E-W axis, in which the reticle of a telescope is always in the plane of the meridian. It is used to time the transit of a star, etc, across the meridian | |