The Five Sounds

...at the time of leaving the body original: dehatyakte; possibly referring to the end of a specific cycle or life-event calculation, it is said that among the forty-two days, for Rahu The North Node of the Moon, a shadow planet in Vedic astrology. there are twenty [days] || 20 || and for Ketu The South Node of the Moon. also twenty [days] || 20 ||.

Now, concerning the Major Periods Mahadasha The primary influence of a planet over a significant block of time. of the Sun and the other planets, having a measure of twenty and so on, the author explains the method for determining the Sub-period Antardasha A smaller cycle within the Mahadasha that refines the astrological prediction.:

The Rule for Calculating Sub-periods

Multiply the duration of the period by itself, and divide that product by the total sum of all periods. The resulting quotient should be known as the days. Multiply the remainder by sixty, and divide again by the total sum of all periods; the result is the time-units ghatika A traditional unit of time; 60 ghatikas make one full day and night (24 hours). of the sub-period. || 1 ||

A Mathematical Example

The meaning of this rule is as follows:
Suppose the Major Period Dasha is 20.
Multiply the period by itself (20 multiplied by 20) = 400.
Divide this by the Total Sum of Periods Dashapinda In this specific calculation, the sum of all planetary influences equals 36., which is 36.
The quotient obtained is 11 days.
The remainder is 4.
Multiply the remainder by sixty = 240.
Divide this by the Total Sum of Periods (36) which results in approximately 7.
Because the difference is small original: alpanantara; referring to rounding up the fractional result, the obtained time-units ghatika are 7.