योगवासिष्ठः yogavāsiṣṭhaḥ - book-7, chapter-127, verse-17

द्विगुणा नभसस्तस्मादृक्षचक्रस्य पुष्टता ।
दशदिक्कं विसरतो बिल्वत्वक्सदृशस्थितेः ॥ १७ ॥

dviguṇā nabhasastasmādṛkṣacakrasya puṣṭatā ,
daśadikkaṃ visarato bilvatvaksadṛśasthiteḥ 17

17. dviguṇā nabhasaḥ tasmāt ṛkṣacakrasya puṣṭatā |
daśadikkam visarataḥ bilvatvak sadṛśasthiteḥ ||

17. ṛkṣacakrasya puṣṭatā tasmāt nabhasaḥ dviguṇā.
daśadikkam visarataḥ bilvatvak sadṛśasthiteḥ (ca asti).

17. The massiveness of that sphere of constellations, which extends in all ten directions and whose condition resembles the rind of a bilva fruit, is twice the size of that preceding space.

Words meanings summery:

• द्विगुणा (dviguṇā) - twofold, double, twice

• नभसः (nabhasaḥ) - of the sky/space, from the sky/space

• तस्मात् (tasmāt) - from that preceding space (kha) (from that, from it, therefore)

• ऋक्षचक्रस्य (ṛkṣacakrasya) - of the sphere of constellations, of the circle of stars

• पुष्टता (puṣṭatā) - massiveness, robustness, fullness, solidity

• दशदिक्कम् (daśadikkam) - in ten directions, ten-directional

• विसरतः (visarataḥ) - of the (constellation sphere) which spreads (of one spreading, of one extending)

• बिल्वत्वक् (bilvatvak) - bilva rind, shell of a bilva fruit

• सदृशस्थितेः (sadṛśasthiteḥ) - of a state/condition resembling

Words meanings and morphology

द्विगुणा (dviguṇā) - twofold, double, twice

(adjective)

Nominative, feminine, singular of dviguṇa

dviguṇa - twofold, double, twice

Compound type : tatpuruṣa (dvi+guṇa)

• dvi – two
  numeral
• guṇa – multiplier, quality, thread
  noun (masculine)

नभसः (nabhasaḥ) - of the sky/space, from the sky/space

(noun)

Genitive, neuter, singular of nabhas

nabhas - sky, atmosphere, space, heaven

तस्मात् (tasmāt) - from that preceding space (kha) (from that, from it, therefore)

(pronoun)

Ablative, neuter, singular of tad

tad - that, he, she, it

ऋक्षचक्रस्य (ṛkṣacakrasya) - of the sphere of constellations, of the circle of stars

(noun)

Genitive, neuter, singular of ṛkṣacakra

ṛkṣacakra - sphere of constellations, circle of stars

Compound type : tatpuruṣa (ṛkṣa+cakra)

• ṛkṣa – star, constellation
  noun (masculine)
• cakra – circle, wheel, sphere, disk
  noun (neuter)

पुष्टता (puṣṭatā) - massiveness, robustness, fullness, solidity

(noun)

Nominative, feminine, singular of puṣṭatā

puṣṭatā - massiveness, robustness, stoutness, fullness, strength

From 'puṣṭa' (nourished, strong) + suffix 'tā'

दशदिक्कम् (daśadikkam) - in ten directions, ten-directional

(adjective)

Accusative, neuter, singular of daśadikka

daśadikka - ten-directional, extending in ten directions

Compound type : bahuvrīhi (daśa+dik)

• daśa – ten
  numeral
• dik – direction, quarter
  noun (feminine)

Note: Used adverbially here.

विसरतः (visarataḥ) - of the (constellation sphere) which spreads (of one spreading, of one extending)

(adjective)

Genitive, neuter, singular of visarat

visarat - spreading, extending, diffusing

Present Active Participle

From root 'sṛ' (to go, flow) with prefix 'vi'

Prefix: vi

Root: sṛ (class 1)

Note: Modifies ṛkṣacakrasya implicitly.

बिल्वत्वक् (bilvatvak) - bilva rind, shell of a bilva fruit

(noun)

Nominative, feminine, singular of bilvatvak

bilvatvak - bilva rind, bark of the bilva tree

Compound type : tatpuruṣa (bilva+tvak)

• bilva – Aegle marmelos tree or its fruit
  noun (neuter)
• tvak – skin, bark, rind, hide
  noun (feminine)

Note: Part of the compound 'bilvatvaksadṛśasthiteḥ'.

सदृशस्थितेः (sadṛśasthiteḥ) - of a state/condition resembling

(noun)

Genitive, feminine, singular of sadṛśasthiti

sadṛśasthiti - a state or condition resembling (something)

Compound type : tatpuruṣa (sadṛśa+sthiti)

• sadṛśa – similar, resembling, like
  adjective (neuter)
• sthiti – state, condition, existence, position
  noun (feminine)
  From root 'sthā' (to stand)
  Root: sthā (class 1)

Note: The whole phrase 'bilvatvak sadṛśasthiteḥ' means 'of which the state resembles a bilva rind', modifying ṛkṣacakrasya.