You observe the lower limb of the Sun at a...

Question 1 / 2066636eea28f7522a1c51b3ff

Question 1 of 2066636eea28f7522a1c51b3ff

You observe the lower limb of the Sun at a sextant altitude (hs) of 24° 00.7' on 10 January. The index error is 2.6' off the arc. The height of eye is 55 feet. What is the observed altitude (Ho)?

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Question 1 of 20

66636eea28f7522a1c51b3ff

You observe the lower limb of the Sun at a sextant altitude (hs) of 24° 00.7' on 10 January. The index error is 2.6' off the arc. The height of eye is 55 feet. What is the observed altitude (Ho)?

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🔍 Key Concepts

• How to apply index error that is "off the arc" (is that a positive or negative correction to hs?) • How to compute and apply the dip correction for a 55‑foot height of eye to get from apparent altitude (Ha) to observed altitude (Ho) • What extra corrections are needed when shooting the lower limb of the Sun on a given date (refraction, semidiameter, etc.)

💭 Think About

• Start from the given sextant altitude (hs). In what order do you apply index correction, dip, and the Sun’s additional corrections to arrive at Ho? • For an index error of 2.6' off the arc, should you add or subtract 2.6' from hs? Think about what the sextant reads when the index is set at zero. • With a 55 ft height of eye, is the dip a large or small correction in minutes, and is it added or subtracted?

✅ Before You Answer

• After applying index correction, check whether your corrected altitude is slightly higher or lower than hs and whether that makes sense for "off the arc". • Make sure your dip correction is in the right units (minutes of arc) and that you’re using feet, not meters, for the given formula or table. • Confirm that the Sun’s lower limb corrections (refraction + semidiameter, and any small additional terms) move your Ha in the correct direction before you compare to the multiple‑choice options.

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Question 1 of 20

You observe the lower limb of the Sun at a sextant altitude (hs) of 24° 00.7' on 10 January. The index error is 2.6' off the arc. The height of eye is 55 feet. What is the observed altitude (Ho)?

24° 07.4'

24° 08.9'

24° 10.2'

24° 11.8'

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Question 1 / 2066636eea28f7522a1c51b3ff

Question 1 of 2066636eea28f7522a1c51b3ff

You observe the lower limb of the Sun at a sextant altitude (hs) of 24° 00.7' on 10 January. The index error is 2.6' off the arc. The height of eye is 55 feet. What is the observed altitude (Ho)?

Back

Question 1 of 20

66636eea28f7522a1c51b3ff

You observe the lower limb of the Sun at a sextant altitude (hs) of 24° 00.7' on 10 January. The index error is 2.6' off the arc. The height of eye is 55 feet. What is the observed altitude (Ho)?

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