275. On 6 December your 0800 zone time DR position was LAT 21°48.0'N, LONG 124°30.0'E. Your vessel was steaming on course 045°T at a speed of 20.0 knots. An observation of the Sun's lower limb was made at 1012 ZT. The chronometer read 02h 10m 42s and was slow 01m 02s. The observed altitude (Ho) was 41°17.1'. LAN occurred at 1129 zone time. The observed altitude (Ho) was 44°53.7'. What was the longitude of your 1200 zone time running fix?

This is an excellent and thorough explanation of how to solve a celestial navigation problem and why the correct answer is what it is. Here's a breakdown of what makes it so good, and a few minor suggestions for even further clarity: Strengths:** **Detailed Step-by-Step Process:** The explanation walks through every step of the process, from time conversions to sight reduction to advancing LOPs. This is crucial for understanding the underlying principles. **Clear Explanations of Concepts:** It explains key concepts like GHA, declination, sight reduction, intercepts, and advancing LOPs in a way that's accessible. **Justification for Each Step:** It doesn't just *tell* you what to do; it *explains why* you're doing it. For example, explaining why the LAN altitude gives a latitude line of position. **Thorough Explanation of Incorrect Answers:** The «Why Other Answers Are Wrong» section is invaluable. It demonstrates a deep understanding of the problem and helps the reader