Which of the four adjustable errors in the...

Question 1 / 2707066636ee928f7522a1c5197e7

Question 1 of 2707066636ee928f7522a1c5197e7

Which of the four adjustable errors in the sextant is the principle cause of index error?

Question 1 of 27070

Which of the four adjustable errors in the sextant is the principle cause of index error?

🔍 Key Concepts

• Index error and how it appears when bringing the horizon together with no celestial body observed • Relationship between the index mirror and horizon glass when the sextant reads 0° • Which adjustments affect parallelism versus perpendicularity

💭 Think About

• When you set the sextant to 0°, what two images of the horizon are you actually comparing, and through which mirrors? • Which specific misalignment would cause the two horizon images to be offset even when the scale reads 0°? • Of the four listed adjustments, which one directly controls whether the reflected ray and direct ray are aligned when the index is at zero?

✅ Before You Answer

• Be clear on how the index error test is performed (sextant set to 0°, viewing the horizon). • Identify which component(s) control the relative angle between the index mirror and the horizon glass. • Eliminate any options that mainly affect perpendicularity to the frame without directly setting the angle between the two mirrors.

Question 1 of 27070

Which of the four adjustable errors in the sextant is the principle cause of index error?

Horizon glass not being perpendicular to the frame

Index mirror and horizon glass not being parallel

Index mirror not being perpendicular to the frame

Telescope not being parallel to the frame

Question 1 / 2707066636ee928f7522a1c5197e7

Question 1 of 2707066636ee928f7522a1c5197e7

Which of the four adjustable errors in the sextant is the principle cause of index error?

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Question 1 of 27070

Which of the four adjustable errors in the sextant is the principle cause of index error?