What it means
Every Mahadasha divides into nine Antardashas, one for each graha, in the same fixed order and in proportion to the planets' Vimshottari years. A Saturn Mahadasha of nineteen years opens with a Saturn-Saturn Antardasha, then Saturn-Mercury, and so on.
How it is read
This is the level most readings actually work at. A Mahadasha sets the register of a decade or two; the Antardasha inside it is what varies year to year, and the combination of the two lords - how they sit relative to each other in the chart - is what an astrologer reads.
What to watch for
Subdivision continues: Pratyantardasha below Antardasha, and further still. Each level narrows the window, but the confidence does not increase with the precision - a chart cast from an uncertain birth time cannot support a claim about a particular fortnight.
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