When correcting apparent altitude to...

Question 1 / 2707066636ee928f7522a1c51942f

Question 1 of 2707066636ee928f7522a1c51942f

When correcting apparent altitude to observed altitude, you do NOT apply a correction for __________.

Question 1 of 27070

When correcting apparent altitude to observed altitude, you do NOT apply a correction for __________.

🔍 Key Concepts

• Sextant altitude corrections (from sextant altitude to apparent altitude, then to observed altitude) • Which corrections are related to the eye and instrument versus the Earth and atmosphere • The specific meaning of apparent altitude vs observed altitude

💭 Think About

• List the usual sequence of corrections you apply starting from sextant altitude and note which part of the process gets each correction (index error, dip, refraction, semi‑diameter, parallax, etc.) • Ask yourself: by the time you already have apparent altitude, which effects have already been accounted for, and what is left to correct to reach observed altitude? • Consider which option is NOT tied to the step from apparent altitude to observed altitude but to some other stage or concept in sight reduction.

✅ Before You Answer

• Be clear on the definitions: sextant altitude (Hs), apparent altitude (Ha), observed altitude (Ho) • Verify which corrections deal with light bending in the atmosphere and shape/size of the celestial body • Check which choice refers to a correction that is connected to the geometric Earth center vs observer’s position, and decide whether that belongs in the apparent→observed step.

Question 1 of 27070

When correcting apparent altitude to observed altitude, you do NOT apply a correction for __________.

inaccuracies in the reference level

the bending of the rays of light from the body

the equivalent reading to the center of the body

the equivalent reading from the center of the Earth

Question 1 / 2707066636ee928f7522a1c51942f

Question 1 of 2707066636ee928f7522a1c51942f

When correcting apparent altitude to observed altitude, you do NOT apply a correction for __________.

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Question 1 of 27070

When correcting apparent altitude to observed altitude, you do NOT apply a correction for __________.