योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-81, verse-58

तस्यां भ्रमन्त्यां चतुरं चन्द्रार्कदिनरात्रयः ।
नखाग्रलेखालोकान्तर्भ्रान्तिकाञ्चनसूत्रवत् ॥ ५८ ॥

tasyāṃ bhramantyāṃ caturaṃ candrārkadinarātrayaḥ ,
nakhāgralekhālokāntarbhrāntikāñcanasūtravat 58

58. tasyām bhramantyām caturam candrārkadinārātrayaḥ
nakhāgralekhālōkāntarbhrāntikāñcanasūtravat

58. tasyām bhramantyām candrārkadinārātrayaḥ caturam
nakhāgralekhālōkāntarbhrāntikāñcanasūtravat

58. As it (the Earth) gracefully revolves, the moons, suns, days, and nights move precisely, like a golden thread swirling within the apparent confines of a fingernail-tip's trace.

Words meanings summery:

• तस्याम् (tasyām) - on the Earth (implied from context of surrounding verses) (in her, on her, to her)

• भ्रमन्त्याम् (bhramantyām) - (Earth) as it revolves/spins (while revolving, while whirling, while wandering)

• चतुरम् (caturam) - skillfully, gracefully, cleverly, precisely

• चन्द्रार्कदिनारात्रयः (candrārkadinārātrayaḥ) - celestial bodies and time divisions (moons, suns, days, and nights)

• नखाग्रलेखाल्ओकान्तर्भ्रान्तिकाञ्चनसूत्रवत् (nakhāgralekhālōkāntarbhrāntikāñcanasūtravat) - a simile describing the subtle yet precise movement of celestial bodies/time (like a golden thread whirling within the appearance of a fingernail-tip's mark)

Words meanings and morphology

तस्याम् (tasyām) - on the Earth (implied from context of surrounding verses) (in her, on her, to her)

(pronoun)

Locative, feminine, singular of tad

tad - that, she, it

Note: Refers to the Earth, although 'bhūmi' is not explicitly mentioned in this verse.

भ्रमन्त्याम् (bhramantyām) - (Earth) as it revolves/spins (while revolving, while whirling, while wandering)

(adjective)

Locative, feminine, singular of bhramantī

bhramantī - revolving, whirling, wandering, moving

Present Active Participle

Feminine singular locative of bhramant, from root bhram (class 1, to whirl, move about)

Root: bhram (class 1)

चतुरम् (caturam) - skillfully, gracefully, cleverly, precisely

(adjective)

Accusative, neuter, singular of catura

catura - skillful, graceful, clever; fourfold

Note: Functions as an adverb.

चन्द्रार्कदिनारात्रयः (candrārkadinārātrayaḥ) - celestial bodies and time divisions (moons, suns, days, and nights)

(noun)

Nominative, masculine, plural of candrārkadinārātri

candrārkadinārātri - moon, sun, day, and night (collectively)

Compound type : dvandva (candra+arka+dina+rātri)

• candra – moon
  noun (masculine)
• arka – sun
  noun (masculine)
• dina – day
  noun (neuter)
• rātri – night
  noun (feminine)

Note: Subject of an implied verb of motion (e.g., 'bhramanti' - they whirl).

नखाग्रलेखाल्ओकान्तर्भ्रान्तिकाञ्चनसूत्रवत् (nakhāgralekhālōkāntarbhrāntikāñcanasūtravat) - a simile describing the subtle yet precise movement of celestial bodies/time (like a golden thread whirling within the appearance of a fingernail-tip's mark)

(indeclinable)

Compound ending in -vat (suffix for 'like').

Compound type : bahuvrīhi (ending in vat) (nakha+agra+lekhā+āloka+antara+bhrānti+kāñcana+sūtra+vat)

• nakha – fingernail, claw
  noun (masculine)
• agra – tip, point, front part, top
  noun (neuter)
• lekhā – line, trace, mark, streak
  noun (feminine)
• āloka – light, sight, appearance, perception
  noun (masculine)
  From prefix ā- and root √lok (to see, perceive).
  Prefix: ā
  Root: lok (class 1)
• antara – inside, within, interval, interior
  indeclinable
• bhrānti – whirling, revolving, illusion, error, confusion
  noun (feminine)
  From root bhram (to whirl).
  Root: bhram (class 1)
• kāñcana – golden, made of gold; gold
  noun (neuter)
• sūtra – thread, string, aphorism
  noun (neuter)
• vat – like, as if, similar to
  indeclinable
  Secondary suffix used to form adverbs or adjectives indicating similarity.

Note: Acts as an adverbial phrase of comparison.