### SB 3.11.10

> यामाश्चत्वारश्चत्वारो मर्त्यानामहनी उभे ।\
> पक्षः पञ्चदशाहानि शुक्लः कृष्णश्च मानद ॥१०॥

> yāmāś catvāraś catvāro\
> martyānām ahanī ubhe\
> pakṣaḥ pañca-daśāhāni\
> śuklaḥ kṛṣṇaś ca mānada

*yāmāḥ*—three hours; *catvāraḥ*—four; *catvāraḥ*—and four; *martyānām*—of the human beings; *ahanī*—duration of day; *ubhe*—both day and night; *pakṣaḥ*—fortnight; *pañca-daśa*—fifteen; *ahāni*—days; *śuklaḥ*—white; *kṛṣṇaḥ*—black; *ca*—also; *mānada*—measured.

**It is calculated that there are four praharas, which are also called yāmas, in the day and four in the night of the human being. Similarly, fifteen days and nights are a fortnight, and there are two fortnights, white and black, in a month.**