Śrīmad-Bhāgavatam 3.11.6
త్రసరేణుత్రికం భుఙ్క్తే య: కాల: స త్రుటి: స్మృత: ।
శతభాగస్తు వేధ: స్యాత్తైస్త్రిభిస్తు లవ: స్మృత: ॥ ౬ ॥
trasareṇu-trikaṁ bhuṅkte
[trasarenu-trikam bhunkte]
yaḥ kālaḥ sa truṭiḥ smṛtaḥ
[yah kaalah sa trutih smritah]
śata-bhāgas tu vedhaḥ syāt
[shata-bhaagas tu vedhah syaat]
tais tribhis tu lavaḥ smṛtaḥ
[tais tribhis tu lavah smritah]
Word-for-word
trasareṇu-trikam
—
combination of three hexatoms
bhuṅkte
—
as they take time to integrate
yaḥ
—
that which
kālaḥ
—
duration of time
saḥ
—
that
truṭiḥ
—
by the name truṭi
smṛtaḥ
—
is called
śata-bhāgaḥ
—
one hundred truṭis
tu
—
but
vedhaḥ
—
called a vedha
syāt
—
it so happens
taiḥ
—
by them
tribhiḥ
—
three times
tu
—
but
lavaḥ
—
lava
smṛtaḥ
—
so called.
Blended reading (Sanskrit + English inline)
trasareṇu-trikaṁ bhuṅkte
trasareṇu-trikam
combination of three hexatoms
bhuṅkte
as they take time to integrate
yaḥ kālaḥ sa truṭiḥ smṛtaḥ
yaḥ
that which
kālaḥ
duration of time
saḥ
that
truṭiḥ
by the name truṭi
smṛtaḥ
is called
śata-bhāgas tu vedhaḥ syāt
śata-bhāgaḥ
one hundred truṭis
tu
but
vedhaḥ
called a vedha
syāt
it so happens
tais tribhis tu lavaḥ smṛtaḥ
taiḥ
by them
tribhiḥ
three times
tu
but
lavaḥ
lava
smṛtaḥ
so called.
The time duration needed for the integration of three trasareṇus is called a truṭi, and one hundred truṭis make one vedha. Three vedhas make one lava.
Purport
It is calculated that if a second is divided into 1, 687.5 parts, each part is the duration of a truṭi, which is the time occupied in the integration of eighteen atomic particles. Such a combination of atoms into different bodies creates the calculation of material time. The sun is the central point for calculating all different durations.
— A.C. Bhaktivedanta Swami Prabhupāda
Gauḍīya Ācāryas
Viśvanātha Cakravartī Ṭhākura
Gauḍīya
Translation
The time it takes for the sun to pass over three trasareṇus is called a truṭi. A hundred truṭis make one vedha. Three vedhas make one lava.
Three trasareṇus make one truṭi. According to Surya-siddhānta, a truṭi is defined as the time taken for a needle to pierce a lotus leaf. One hundred truṭis make a vedha. Three vedhas make a lava.
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Source: vedabase.io