Which term is given to the arc of an hour...

Question 1 of 2707066636ee928f7522a1c51918e

Which term is given to the arc of an hour circle between the celestial equator and a point on the celestial sphere, measured northward or southward through 90°?

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Question 1 of 27070

Q

Which term is given to the arc of an hour circle between the celestial equator and a point on the celestial sphere, measured northward or southward through 90°?

🔍 Key Concepts

• Difference between altitude and a coordinate measured from the celestial equator • How declination relates to latitude on the celestial sphere • The meaning of an hour circle and how it’s used in celestial coordinates

💭 Think About

• Ask yourself: Which of these terms is specifically tied to the celestial equator rather than the horizon? • Think about which choice is normally expressed as degrees north or south, up to a maximum of 90°. • Consider: Altitude and azimuth are usually referenced to what plane or point, and is that the same as an hour circle from the equator?

✅ Before You Answer

• Confirm which option is defined as the angular distance north or south of the celestial equator. • Verify which terms (altitude, azimuth) are usually measured from the observer’s horizon or meridian, not the celestial equator. • Make sure the quantity you pick is limited to +90° to −90°, not 0° to 360°.