In high latitudes, celestial observations...

Question 1 / 2066636ee928f7522a1c519892

Question 1 of 2066636ee928f7522a1c519892

In high latitudes, celestial observations can be made over a horizon covered with pack ice by bringing the sun tangent to the ice and __________.

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Question 1 of 20

66636ee928f7522a1c519892

In high latitudes, celestial observations can be made over a horizon covered with pack ice by bringing the sun tangent to the ice and __________.

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🔍 Key Concepts

• Celestial navigation in ice-covered waters and how the visible "horizon" changes • Purpose and meaning of dip correction in sextant observations • Special tables in Bowditch Vol. II for non-standard horizons (ice, shore, etc.)

💭 Think About

• Ask yourself: when the sea horizon is blocked by pack ice, what is effectively becoming your new horizon, and how does that affect the way you correct your sextant altitude? • Think about whether semidiameter has anything to do with the horizon itself, or only with the apparent size/position of the Sun’s limb. • Consider which correction (or table) is specifically designed to adjust for an artificial or raised horizon, such as ice, a shoreline, or other obstructions.

✅ Before You Answer

• Make sure you are clear on what dip correction actually corrects for (height of eye above the true sea horizon). • Check in your mental picture of Bowditch whether there is a special dip table for unusual horizons (like ice or shore), and how it’s labeled. • Verify whether doubling the semidiameter or adding a fixed angle (like 30°) has any recognized role in standard sight reduction procedures for a Sun sight over an obstructed horizon.

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Question 1 of 20

In high latitudes, celestial observations can be made over a horizon covered with pack ice by bringing the sun tangent to the ice and __________.

doubling the semidiameter correction

using a dip correction based on the height of eye above the ice

adding 30° of arc to the sight

using a dip correction from table 22 in Bowditch Vol. II

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Question 1 / 2066636ee928f7522a1c519892

Question 1 of 2066636ee928f7522a1c519892

In high latitudes, celestial observations can be made over a horizon covered with pack ice by bringing the sun tangent to the ice and __________.

Back

Question 1 of 20

66636ee928f7522a1c519892

In high latitudes, celestial observations can be made over a horizon covered with pack ice by bringing the sun tangent to the ice and __________.

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