A semidiameter correction is applied to...

Question 1 of 2707066636ee928f7522a1c51a078

A semidiameter correction is applied to observations of __________.

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Question 1 of 27070

Q

A semidiameter correction is applied to observations of __________.

🔍 Key Concepts

• Semidiameter correction in celestial navigation tables (Nautical Almanac) • Difference between observing a limb (edge) of a body vs. its center • Which celestial bodies are large enough in apparent size to have a measurable disk

💭 Think About

• Think about when you use upper limb or lower limb observations in sextant sights. Which bodies are commonly shot this way? • Which of these bodies appear as a true, visible disk through a sextant, and which appear more like a point of light? • In the Nautical Almanac, for which bodies do you see separate columns or notes about semidiameter values?

✅ Before You Answer

• Verify which of the listed bodies have a visible disk large enough to have a significant angular radius (semidiameter). • Check your Nautical Almanac: see which bodies have a tabulated semidiameter correction in the sight reduction data. • Confirm which bodies are normally observed by limb rather than by center (point of light).