योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-193, verse-8

क्वाप्यज्ञानरवौ याते प्रतापाद्याकरे भृशम् ।
संसारसत्तादिवसो यात्यस्तं स निशागमः ॥ ८ ॥

kvāpyajñānaravau yāte pratāpādyākare bhṛśam ,
saṃsārasattādivaso yātyastaṃ sa niśāgamaḥ 8

8. kva api ajñānaravau yāte pratāpādyākare bhṛśam
saṃsārasattādivasaḥ yāti astam saḥ niśāgamaḥ

8. kva api ajñānaravau pratāpādyākare bhṛśam yāte
saṃsārasattādivasaḥ astam yāti saḥ niśāgamaḥ

8. When the sun of ignorance (ajñāna), which is a great source of radiance and power, has completely set, then the day of worldly existence (saṃsāra) also comes to an end, and that is the arrival of [true] night.

Words meanings summery:

• क्व (kva) - where, somewhere

• अपि (api) - adds an indefinite sense to 'kva' (somewhere, to some degree) (even, also, and)

• अज्ञानरवौ (ajñānaravau) - when the sun of ignorance has set (in/on the sun of ignorance)

• याते (yāte) - when it (the sun of ignorance) has gone or set (having gone, having set)

• प्रतापाद्याकरे (pratāpādyākare) - qualifying the sun of ignorance as a source of radiance and power (in/on the source of splendor and so forth)

• भृशम् (bhṛśam) - exceedingly, greatly, completely, intensely

• संसारसत्तादिवसः (saṁsārasattādivasaḥ) - the day of worldly existence

• याति (yāti) - comes to an end (idiomatic with 'astam') (goes, proceeds)

• अस्तम् (astam) - to an end, to cessation (to setting, to disappearance, to rest)

• सः (saḥ) - that (refers to the ending of worldly existence) (that, he)

• निशागमः (niśāgamaḥ) - the arrival of the metaphorical night (of peace/liberation) (arrival of night, coming of night)

Words meanings and morphology

क्व (kva) - where, somewhere

(indeclinable)

अपि (api) - adds an indefinite sense to 'kva' (somewhere, to some degree) (even, also, and)

(indeclinable)

अज्ञानरवौ (ajñānaravau) - when the sun of ignorance has set (in/on the sun of ignorance)

(noun)

Locative, masculine, singular of ajñānaravi

ajñānaravi - sun of ignorance

Compound type : tatpurusha (ajñāna+ravi)

• ajñāna – ignorance, nescience
  noun (neuter)
  A (negating prefix) + jñāna
  Root: jñā (class 9)
• ravi – sun
  noun (masculine)

याते (yāte) - when it (the sun of ignorance) has gone or set (having gone, having set)

(participle)

Locative, masculine, singular of yāta

yāta - gone, departed, arrived at, happened

Past Passive Participle

from √yā (to go) + kta

Root: yā (class 2)

प्रतापाद्याकरे (pratāpādyākare) - qualifying the sun of ignorance as a source of radiance and power (in/on the source of splendor and so forth)

(noun)

Locative, masculine, singular of pratāpādyākara

pratāpādyākara - source of splendor and so forth, mine of power etc.

Compound type : tatpurusha (pratāpa+ādi+ākara)

• pratāpa – splendor, majesty, heat, power
  noun (masculine)
  from √tap with prati
  Prefix: prati
  Root: tap (class 1)
• ādi – beginning, first, and so forth, etc.
  noun/adjective (masculine)
• ākara – mine, source, origin, collection
  noun (masculine)
  from √kṛ with ā
  Prefix: ā
  Root: kṛ (class 8)

Note: Qualifies ajñānaravau.

भृशम् (bhṛśam) - exceedingly, greatly, completely, intensely

(indeclinable)

Note: Modifies yāte ('set completely').

संसारसत्तादिवसः (saṁsārasattādivasaḥ) - the day of worldly existence

(noun)

Nominative, masculine, singular of saṃsārasattādivasa

saṁsārasattādivasa - day of worldly existence (saṃsāra)

Compound type : tatpurusha (saṃsāra+sattā+divasa)

• saṃsāra – transmigration, cycle of birth and death, worldly existence
  noun (masculine)
  from √sṛ (to flow) with sam
  Prefix: sam
  Root: sṛ (class 1)
• sattā – existence, being, reality
  noun (feminine)
  from √as (to be)
  Root: as (class 2)
• divasa – day
  noun (masculine)
  Root: div (class 4)

याति (yāti) - comes to an end (idiomatic with 'astam') (goes, proceeds)

(verb)

3rd person , singular, active, present (laṭ) of yā

present active

3rd person singular present active

Root: yā (class 2)

अस्तम् (astam) - to an end, to cessation (to setting, to disappearance, to rest)

(noun)

Accusative, masculine, singular of asta

asta - gone, set, disappeared

Root: as (class 4)

सः (saḥ) - that (refers to the ending of worldly existence) (that, he)

(pronoun)

Nominative, masculine, singular of tad

tad - that, he, she, it

Note: Refers to niśāgamaḥ.

निशागमः (niśāgamaḥ) - the arrival of the metaphorical night (of peace/liberation) (arrival of night, coming of night)

(noun)

Nominative, masculine, singular of niśāgama

niśāgama - arrival of night, coming of night

Compound type : tatpurusha (niśā+āgama)

• niśā – night
  noun (feminine)
  Root: niś
• āgama – coming, arrival, acquisition
  noun (masculine)
  from √gam with ā
  Prefix: ā
  Root: gam (class 1)