At about GMT 1436, on 3 December, the lower...

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Question 1 of 2066636ee928f7522a1c519827

At about GMT 1436, on 3 December, the lower limb of the Moon is observed with a sextant having an index error of 2.5' on the arc. The height of eye is 32 feet. The sextant altitude (hs) is 3°38.8'. What is the observed altitude?

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Question 1 of 20

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🔍 Key Concepts

• Index error on the arc vs. off the arc and how it changes sextant altitude • How to apply dip (height of eye correction) to the sextant altitude • Sequence of corrections to go from hs (sextant altitude) to Ho (observed altitude)

💭 Think About

• In what order do you apply index correction and dip correction when starting from the sextant altitude? Write this out step by step. • Is an index error "on the arc" added or subtracted from the sextant reading? How does that affect the intermediate altitude? • After applying all corrections, should the final observed altitude be greater or less than the original sextant altitude in this case?

✅ Before You Answer

• Be sure you convert height of eye in feet to dip in minutes of arc using the standard table or formula, not by guessing. • Check the sign of each correction (index and dip) carefully before applying it. • Confirm that you are using the lower limb of the Moon, which tells you whether any additional corrections would normally be applied beyond index and dip for Ho vs. Hc problems.

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