Question 1700Navigation General

70% to pass

The equation of time is 8m 40s. The apparent Sun is ahead of the mean Sun. If you are on the central meridian of your time zone, the apparent Sun will cross your meridian at _______________.

A 11-51-20 ZT
B 12-00-00 ZT
C 12-04-20 ZT
D 12-08-40 ZT
AI Explanation

The correct answer is A) 11-51-20 ZT. The equation of time is the difference between apparent solar time and mean solar time. When the apparent Sun is ahead of the mean Sun, the apparent solar time will be ahead of the mean solar time. Since the equation of time is given as 8m 40s, and the apparent Sun is ahead, the apparent solar time will be 8m 40s ahead of the mean solar time. Therefore, if you are on the central meridian of your time zone, the apparent Sun will cross your meridian 8m 40s earlier than the mean Sun, which is 11-51-20 ZT. The other options are incorrect because they do not account for the equation of time being positive, indicating the apparent Sun is ahead of the mean Sun.

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