Rahu Mahadasha

Rahu is not a body but the point where the Moon's path crosses the Sun's, and the texts treat it as appetite without a natural limit. It signifies the foreign and the unfamiliar, ambition, technology, crowds, unconventional routes and whatever a person has not yet had and wants badly. Its mahadasha is traditionally described as a period in which the horizon widens: new places, people, fields and methods come within reach, old frameworks feel too small, and the person is pulled towards what is unusual or not yet understood. The pace is uneven, with sudden accelerations and reversals, and the lessons concern discernment and the difference between hunger and direction.

Rahu rules no sign, so its period borrows its character from the sign it occupies, that sign's lord, and the planets sitting with it. Rahu in an upachaya house, the third, sixth, tenth or eleventh, with its sign lord well placed, is described as a period in which ambition finds somewhere to go and outsiders become allies. Rahu in the eighth or twelfth house, or beside the Moon or a weak lagna lord, is described as a period in which the mind runs ahead of the facts and plans change often. Rahu joined with Jupiter, Saturn or Venus takes on the concerns of that planet, so the same eighteen years can look like study, labour or pleasure in different charts.

The antardashas open with Rahu's own sub period of about two years and eight months, then move through Jupiter, Saturn, Mercury, Ketu, Venus, Sun, Moon and Mars. The Jupiter antardasha is often read as the moment the period's restlessness finds a frame; the Saturn and Mercury antardashas give its middle a more laborious and calculating texture; the one year Ketu sub period can feel like a sharp withdrawal; the three year Venus antardasha is the longest and most sociable; and the short Sun, Moon and Mars sub periods bring it to a brisk close.

A Rahu mahadasha is not a warning and not a promise of sudden wealth, foreign residence or a transformed life, though it is sold as all of these. The classical texts describe where attention and appetite go during the period, not events on a calendar, and eighteen years can contain long stretches of ordinary routine. Nor does the rest of the chart fall silent: the lagna lord, the Moon, Rahu's dispositor and the antardasha lord of the moment all shape what the period actually looks like.