The principal vertical circle is that great...

Question 1 / 2707066636ee928f7522a1c519ed3

Question 1 of 2707066636ee928f7522a1c519ed3

The principal vertical circle is that great circle on the celestial sphere that passes through which of the following?

Question 1 of 27070

The principal vertical circle is that great circle on the celestial sphere that passes through which of the following?

🔍 Key Concepts

• Definition of a vertical circle on the celestial sphere • Relationship between the zenith (point directly overhead) and great circles • Difference between circles that pass through the poles versus those that are parallel to the horizon

💭 Think About

• Ask yourself: A vertical circle must start at the zenith; what other point must it reach so that it becomes a great circle rather than a small circle? • Which option describes a circle that is truly vertical, i.e., rising straight up from the horizon through the zenith, instead of running along or parallel to the horizon? • Do all great circles on the celestial sphere have to pass through the poles, or only some special ones (like meridians)?

✅ Before You Answer

• Verify which choice describes a great circle, not a small circle • Confirm that a principal vertical circle must pass through the zenith and also intersect the horizon at right angles • Eliminate any option that describes a circle that is parallel to the horizon or that only involves the poles and a terrestrial reference (like Greenwich)

Question 1 of 27070

The principal vertical circle is that great circle on the celestial sphere that passes through which of the following?

The zenith and the celestial body

The poles and Greenwich

The zenith and the north and south poles

The zenith and is parallel to the horizon

Question 1 / 2707066636ee928f7522a1c519ed3

Question 1 of 2707066636ee928f7522a1c519ed3

The principal vertical circle is that great circle on the celestial sphere that passes through which of the following?

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Question 1 of 27070

The principal vertical circle is that great circle on the celestial sphere that passes through which of the following?