Question 1597Navigation General

70% to pass

In order for a star to be used for a sight at lower transit, the star must _______________.

A have the SHA equal to or less than the LHA
B have a declination equal to or greater than your latitude
C be circumpolar
D have a GHA of 180°
AI Explanation

The correct answer is C) be circumpolar. For a star to be used for a sight at lower transit, it must be a circumpolar star, meaning the star never sets below the horizon at your location. This ensures the star is visible throughout its entire diurnal circle, including the lower transit. The other options are incorrect because: A) The star's SHA (Sidereal Hour Angle) relative to the LHA (Local Hour Angle) is not relevant for a lower transit sight. B) The star's declination being equal to or greater than your latitude is not a requirement for a lower transit sight. D) The star's GHA (Greenwich Hour Angle) of 180° is also not a necessary condition for a lower transit sight.

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Official Resources
USCG Navigation Rules (COLREGS) 33 CFR Navigation Rules USCG National Maritime Center
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