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Unformatted text preview: angle. Polaris at Elongation Polaris makes a counterclockwise circle around the true pole of about one degree radius. Upper culmination = polaris at its highest point, when it is traveling west (left) Western elongation = polaris at its western most point, traveling down Lower culmination = polaris at its lowest point traveling east (right) Eastern elongation = polalris at its eastern most point, traveling up. At western or eastern elongation, the star's azimuth is nearly constant for about 10-15 minutes. A large time error will translate into negligible azimuth error at these places, therefore they are preferred for highest accurcy. At culmination, the star is traveling left or right at is greatest speed, and a time error will translate into the maximum amount of azimuth error. Accurate time is essential here....
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- Spring '11
- Polaris, Elongation Polaris, Spherical astronomy