A phase correction may be applicable to...

Question 1 of 2707066636ee928f7522a1c519e27

A phase correction may be applicable to correct the sextant altitude correction of __________.

Question 1 of 27070

A phase correction may be applicable to correct the sextant altitude correction of __________.

🔍 Key Concepts

• Sextant altitude corrections: understand index error, dip, refraction, semi-diameter, parallax, and phase correction • Which bodies show different illuminated phases when viewed from Earth (like a crescent, half, gibbous)? • How the Nautical Almanac altitude correction tables differ for stars, planets, and the Sun

💭 Think About

• Ask yourself: Which celestial bodies do NOT appear as perfect points of light, and can show a visible changing phase from Earth? • Consider how phase affects where the center of light appears compared to the true geometric center of the body—would this matter for stars? For the Sun? For planets? • Look at how the Nautical Almanac groups its altitude corrections: do stars use the same detailed breakdown of corrections as the bodies that show phases?

✅ Before You Answer

• Verify in the Nautical Almanac which bodies have a separate note or line for phase correction in the altitude correction section • Confirm that stars are treated as point sources with a single standard correction, without phase considerations • Check which planets in the Almanac show guidance about phase or center of light vs. center of body when using sextant altitudes