🔍 Key Concepts
• Assumed position (AP) based on DR latitude and longitude at the time of the sight
• Sextant altitude corrections: index error, height of eye (dip), refraction, semi‑diameter for lower limb of the Sun
• Relationship between Local Hour Angle (LHA), latitude, declination, and resulting azimuth (Zn) in the correct quadrant
💭 Think About
• First, advance your 0516 ZT position to 0927 ZT using the given course and speed. How many miles will you travel, and in what general direction will that move your latitude and longitude?
• From your DR position at 0927 ZT, form the assumed position used in the sight reduction. How will rounding of latitude and LHA affect the AP?
• Once you have Hc and Zn from the sight reduction, think about where the Sun should appear from your location and time: is it generally to the east or west, and is it in the NE, SE, SW, or NW quadrant?
✅ Before You Answer
• Be sure the chronometer error (fast/slow) is applied in the correct sense when finding UTC of the observation.
• Confirm that your LHA is in the correct range (0°–360°) and that you’ve used West longitude with the correct sign convention when combining with GHA.
• Before picking an answer, check whether your computed Zn quadrant (NE/SE/SW/NW) matches the physical situation (morning sight in mid‑latitude N, in the eastern Pacific).