Question

Match List I (Description of Celestial Intersections) with List II (Technical Names):

List I		List II
A.	Intersection of Unmandala and Meridian	I.	Svanirakshamandhyam
B.	Intersection of Meridian and Horizon	II.	Dhruvasthanam
C.	Intersection of Nadi-vritta and Meridian	III.	Samasthanam
D.	Intersection of Vimandala and Ecliptic	IV.	Pata (Node)

• A. A-III, B-IV, C-II, D-I
• B. A-IV, B-I, C-III, D-II
• C. A-I, B-II, C-IV, D-III
• D. A-II, B-III, C-I, D-IV

Hint:

'Pata' always refers to nodes—the intersection of orbits. If you see "Vimandala" and "Ecliptic," the answer MUST be Pata (IV). This one match often eliminates most incorrect options.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
In spherical astronomy, the celestial sphere is mapped using several intersecting 'Great Circles'. The points where these circles cross each other are crucial reference points for planetary coordinates.

Step 2: Detailed Matching of Intersection Points:
1. Vimandala and Ecliptic (D): The Vimandala is the orbital plane of a planet, and the Kranti-vritta is the Ecliptic. The two points where the planet's orbit crosses the Sun's path are called the Nodes (Pata). (D matches IV).
2. Meridian and Horizon (B): The point where the local meridian (Yamya-uttara-vritta) intersects the horizon (Kshitija) in the North or South is essentially a stationary cardinal point. In many contexts, the point directly overhead is the Zenith, but the horizon intersection relates to the cardinal orientation or the Samasthanam (equalized position). (B matches III).
3. Unmandala and Meridian (A): The Unmandala is the celestial equator's circle for an observer at the pole. Its intersection with the local meridian relates to the Dhruvasthanam (Pole position). (A matches II).
4. Nadi-vritta and Meridian (C): The Nadi-vritta is the celestial equator. Its intersection with the meridian represents the Svaniraksha-madhyam (the local equator-zenith relationship). (C matches I).

Step 3: Verification:
Sequence: A-II, B-III, C-I, D-IV. This matches Option (4).

Step 4: Final Answer:
The intersections define the reference frame for the observer on Earth.