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Sigma Octantis
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== In astrometrics == Sigma Octantis was used as a reference to measure the magnitudes of stars in the southern hemisphere for the [[Harvard Revised Photometry Catalogue|1908 Revised Harvard Photometry]] catalogue. [[Alpha Ursae Minoris|The Pole Star]] and [[Lambda Ursae Minoris]] were used for the northern hemisphere. It was then noted that "Neither of these stars appears to vary perceptibly" but that, due to the procedures used "if they did, the variation would have no effect on the final measures."<ref name=rhpc/>
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