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As long as it is dark enough (and clear enough) any time after dusk and before dawn is suitable for taking a star sight. Since Polaris is a fairly dim star, you may have to wait a little longer to see it clearly when shooting for latitude. Even a simple protractor can get you in the ballpark as Polaris's angle above the horizon is equal to your degrees above the equator. The 57 other stars used to measure lunar distance were specifically picked for their brightness and because they appear in the celestial sphere from a declination of about 70° south to about 89° north. The nice thing about navigating by lunar distance is all you need is a sextant and a nautical almanac, no chronometer neccessary!

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