On 8 May in DR position LAT 30° 26.0' N,...

Question 1 / 2066636eea28f7522a1c51ae5e

Question 1 of 2066636eea28f7522a1c51ae5e

On 8 May in DR position LAT 30° 26.0' N, LONG 46° 55.1' W, you take an ex-meridian observation of Dubhe. The chronometer time of the sight is 11h 10m 54s, and the chronometer error is 01m 18s slow. The sextant altitude (hs) is 58° 35.0'. The index error is 1.5' on the arc, and your height of eye is 44 feet. What is the latitude at meridian transit?

Back

Question 1 of 20

66636eea28f7522a1c51ae5e

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

• Ex-meridian sight method for latitude (relationship between latitude, declination, and meridian altitude) • Proper reduction of sextant altitude to Ho (index error, dip, and altitude corrections) • Effect of chronometer error (slow/fast) on converting to correct UTC for ex-meridian correction

💭 Think About

• First, focus only on getting a clean Ho from the given hs. What is the sign of the index error when it is 1.5' "on the arc" and how does that affect the altitude? • Think about the basic meridian passage formula: if the star were exactly on the meridian, how would latitude relate to declination and observed altitude? Then consider what changes when the star is a little before or after the meridian (ex‑meridian). • Ask yourself: how does the small time difference from meridian passage affect the altitude you observed, and is the ex‑meridian correction added to or subtracted from the approximate latitude?

✅ Before You Answer

• Be sure you use the correct sign of index error and calculate dip for 44 ft before doing any further work. • Confirm whether the star’s declination is north or south, and decide whether latitude should be same name or contrary name to declination for this sight. • Before choosing a multiple-choice answer, estimate whether the ex‑meridian correction should make the latitude larger or smaller than your DR latitude of 30° 26.0' N. This helps you eliminate unreasonable options.

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed

Question 1 of 20

LAT 30° 12.5' N

LAT 30° 19.8' N

LAT 30° 27.6' N

LAT 30° 35.8' N

Loading interactive features...

Question 1 / 2066636eea28f7522a1c51ae5e

Question 1 of 2066636eea28f7522a1c51ae5e

Back

Question 1 of 20

66636eea28f7522a1c51ae5e

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed