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For reference, Vega (apparent magnitude: 0.0, Bayer designation: α Lyr,
declination +38° 47 ' 01 " and right ascension 18h 36m 56s at the equinox
J2000.0), the second brightest star in the northern celestial hemisphere (the
fifth in the whole celestial sphere), has a location nearly opposite to Sirius
across the watch center, as you can see from its right ascension, and its locus
is nearly equivalent to the 24-hour markers on the dial ring. Though out of
the range of the azimuth/altitude lines, you can guess the position of Vega
through that of Sirius if you know the facts above: positional relationship of
the two stars and the locus of Vega.
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