It is measured by months and half-months. It is not uniform (being ever changing), and moves through all the worlds. Penance and vows are its mud, Passions' force is its mover.
मासार्धमासगणितं विषमं लोकसंचरम्। तमोनियमपङ्कं च रजोवेगप्रवर्तकम्॥