Question 507Navigation General70% to pass
Civil twilight occurs at 0558 zone time on 30 December. Your DR position at that time is LAT 15°02'N, LONG 46°02'W. Which statement concerning the planets available for morning sights is TRUE?
AI Explanation
The correct answer is A) At 0558, Mars can be used for an ex-meridian observation.
The explanation is as follows:
1. Confirm the correct answer: A) is the correct answer.
2. Explanation: At civil twilight, the sun is 6 degrees below the horizon, and several planets may be visible in the morning sky. Since the DR position is at LAT 15°02'N, LONG 46°02'W, Mars would be above the horizon and can be used for an ex-meridian observation at 0558 zone time on 30 December.
3. Explanation of why other options are incorrect:
B) Venus will be below the horizon at this time.
C) Saturn will not be near the prime vertical (due east or due west) at this time.
D) While Venus, Jupiter, and Mars may be visible, they would not yield a good three-line fix since they are not in optimal positions for a morning sight.
Related Questions
#505 Which publication lists Class I and II private aids to navigation in or along navigable waters of the United States? #506 Which describes privately maintained aids to navigation included in the Light List? #508 Civil twilight begins at 1910 zone time on 20 July. Your DR position at that time is LAT 22°16'N, LONG 150°06'W. Which statement concerning the planets available for evening sights is TRUE? #509 In the Nautical Almanac provided, when would Jupiter and Saturn be visible in temperate latitudes for both evening and morning stars? #510 Civil twilight starts at 1812 zone time on 26 August, Your DR position at that time is LAT 21°06'S, LONG 14°56' W. Which statement concerning the planets available for evening sights is TRUE?