If a modern astronomer describes a faint star as being in the constellation cygnus, the swan, you know that the star is

If a modern astronomer describes a faint star as being in the constellation cygnus, the swan, you know that the star is: Somewhere within a particular region of sky having definite boundaries 
The swn of the constellation cygnus is located on northern part of the constellation. This means that the location is limited to the plane part of the milky wat.

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