One verse

Srimad Bhagavatam 3.11.5

3.11.5

अणुर्द्वौ परमाणु स्यात्त्रसरेणुस्त्रय: स्मृत: । जालार्करश्म्यवगत: खमेवानुपतन्नगात् ॥ ५ ॥

anur dvau paramanu syat trasarenus trayah smrtah jalarka-rasmy-avagatah kham evanupatann agat

anuh
double atom
dvau
two
parama-anu
atoms
syat
become
trasarenuh
hexatom
trayah
three
smrtah
considered
jala-arka
of sunshine through the holes of a window screen
rasmi
by the rays
avagatah
can be known
kham eva
towards the sky
anupatan agat
going up.

The division of gross time is calculated as follows: two atoms make one double atom, and three double atoms make one hexatom. This hexatom is visible in the sunshine which enters through the holes of a window screen. One can clearly see that the hexatom goes up towards the sky.