On 26 November your 0535 DR position is LAT...

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Question 1 of 2066636eea28f7522a1c51adae

On 26 November your 0535 DR position is LAT 27°18.9' S, LONG 30°18.4' E. You observe an unidentified planet bearing 085°T at an observed altitude (Ho) of 32°15.2'. The chronometer reads 03h 33m 16s, and is 01m 48s slow. What planet did you observe?

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Question 1 of 20

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🔍 Key Concepts

• Converting chronometer time to GMT (UT1) including chronometer error and date • Using the Nautical Almanac planet pages (GHA and Dec) for a specific time • Estimating which planet is visible and at what altitude from a given latitude and LHA

💭 Think About

• First, what is the actual GMT of the sight, after you correct for the chronometer being slow, and what is the correct date to use in the Almanac? • From your DR latitude and longitude, what is your Local Hour Angle (LHA) for each planet at that GMT, and which one would give a bearing close to 085°T and an altitude near 32°? • Which planets are normally very bright and commonly used for navigation, and which would realistically be at that altitude and azimuth at that time and date in late November?

✅ Before You Answer

• Be sure you applied the chronometer error with the correct sign (slow vs fast) before entering the Almanac tables • Check that you are using the correct date and hour in the planet pages (watch for date change with GMT) • Verify that the computed altitude (Hc) and azimuth (Zn) for the candidate planet match the observed Ho and bearing reasonably closely before choosing your answer

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