Zenith distance is equal to _________

Question 1 of 2707066636ee928f7522a1c51a7a4

Zenith distance is equal to __________.

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Question 1 of 27070

Q

Zenith distance is equal to __________.

🔍 Key Concepts

• Zenith distance (z) is the angular distance from the observer’s zenith (point directly overhead) to the observed body • Observed altitude (Ho) is the angle of the body above the visible horizon • For any body on the celestial sphere, the angles from zenith and horizon are related to 90°

💭 Think About

• Think about how the angle from the horizon to the body (Ho) and the angle from the zenith to the body (z) fit together on a 90° quadrant • If the body is directly overhead at the zenith, what would Ho be, and what would z be? How do those two values relate? • Imagine increasing Ho toward 90°; does z get larger or smaller, and what does that suggest about the sign between 90° and Ho or z?

✅ Before You Answer

• Be sure you know that Ho is measured from the horizon upward to the body • Remember that zenith distance (z) is measured from the zenith downward to the body • Confirm that the relationship must use 90° because horizon to zenith is a right angle (90°)