निमेषस्त्रिलवो ज्ञेय आम्नातस्ते त्रयः क्षणः ।
क्षणान्पञ्च विदुः काष्ठां लघु ता दश पञ्च च ॥ ७ ॥
ksanan panca viduh kastham
nimesah-duration of time called a nimesa; tri-lavah-duration of three lavas; jneyah-is to be known; amnatah-it is so called; te-they; trayah-three; ksanah-duration of time called a ksana; ksanan-such ksanas; panca-five; viduh-one should understand; kastham-duration of time called a kastha; laghu-duration of time called a laghu; tah-those; dasa panca-fifteen; ca-also.
The duration of time of three lavas is equal to one nimesa, the combination of three nimesas makes one ksana, five ksanas combined together make one kastha, and fifteen kasthas make one laghu.
By calculation it is found that one laghu is equal to two minutes. The atomic calculation of time in terms of Vedic wisdom may be converted into present time with this understanding.