SB 3.11.5

अणुर्द्वौ परमाणू स्यात्त्रसरेणुस्त्रयः स्मृतः ।
जालार्करश्म्यवगतः खमेवानुपतन्नगात् ॥५॥

aṇur dvau paramāṇū syāt
trasareṇus trayaḥ smṛtaḥ
jālārka-raśmy-avagataḥ
kham evānupatann agāt

aṇuḥ - double atom; dvau - two; parama-aṇu - atoms; syāt - become; trasareṇuḥ - hexatom; trayaḥ - three; smṛtaḥ - considered; jāla-arka - of sunshine through the holes of a window screen; raśmi - by the rays; avagataḥ - can be known; kham eva - towards the sky; anupatan agāt - going up.

Text

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.

Purport

The atom is described as an invisible particle, but when six such atoms combine together, they are called a trasareṇu, and this is visible in the sunshine pouring through the holes of a window screen.

Srimad Bhagavatam. Canto 3: The Status Quo

Chapter 11: Calculation of Time, from the Atom. Text 5

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.