90° - Ho = _________

90° - Ho = __________.

Question 1 / 2066636ee928f7522a1c5190a3

Question 1 of 2066636ee928f7522a1c5190a3

90° - Ho = __________.

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Question 1 of 20

66636ee928f7522a1c5190a3

90° - Ho = __________.

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🔍 Key Concepts

• Relationship between observed altitude (Ho) and the angle from the zenith to the celestial body • Difference between altitude (measured up from the horizon) and an angle measured down from the zenith • How a 90° angle relates to the horizon–zenith geometry on the celestial sphere

💭 Think About

• When you measure Ho with a sextant, from where to where is that angle measured? Up from the horizon or down from the zenith? • If an angle is 30° above the horizon, what is the complementary angle from the zenith to that same body? How does that compare to 90° - 30°? • Which of the choices names the angle that is the complement of altitude (i.e., 90° minus altitude)?

✅ Before You Answer

• Identify which term is defined as the angle between the observer’s zenith and the celestial body • Confirm that Ho is an altitude measured from the visible horizon, not from the zenith • Eliminate any choice that represents a longitude/latitude concept or a time/angle from a reference meridian rather than the complement of altitude

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Question 1 of 20

90° - Ho = __________.

zenith distance

sextant altitude

colatitude

LHA

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