On 16 June 0612 zone time, morning stars...

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Question 1 of 2066636eea28f7522a1c51ab1b

On 16 June 0612 zone time, morning stars were observed. The vessel's position was LAT 27° 23.0' S, LONG 56° 22.0' W. The vessel is steaming at 16.0 knots on a course of 212° T. A sextant observation of the Sun's lower limb is made at 0850 zone time. The chronometer reads 00h 53m 19s, and the sextant altitude is 22° 58.6'. The index error is 2.0' off the arc, and the chronometer error is 02m 43s fast. Your height of eye is 61.0 feet. What is the azimuth (Zn) of this sight using the assumed position?

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🔍 Key Concepts

• Dead reckoning (DR) from last known position to time of sight using course and speed • Getting UTC, GHA, and declination of the Sun from chronometer time, chronometer error, and zone time • Using LHA, latitude, and declination to determine the correct azimuth quadrant (NE, SE, SW, or NW) before picking a numerical answer

💭 Think About

• From 0612 ZT to 0850 ZT, how far does the vessel travel at 16 knots, and what is the new DR position used as the assumed position for the Sun sight? • Based on date (16 June) and latitude 27° S, is the Sun’s declination north or south of the equator, and does that put the Sun to the north or south of the observer at mid‑morning? • At mid‑morning, is the Sun east or west of the meridian? Combine this with whether the Sun is to your north or south to decide which quadrant (NE, SE, SW, NW) the azimuth must fall in, and then see which answer choices match that quadrant.

✅ Before You Answer

• Confirm the time conversions: ZT → UTC using the correct zone description for about 56° W, and then correct the chronometer reading with the stated chronometer error before entering the Nautical Almanac. • Double‑check the DR run from 0612 to 0850 at 16.0 knots on 212° T and be sure you’re using that updated position as the assumed position for the Sun sight. • Before using any tables or formulas for Zn, first decide the only physically possible quadrant of the Sun’s azimuth given the hemisphere, date, and time of day, and eliminate any answer choices that fall in impossible quadrants.

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