Guru (Jupiter) mahadasha for Karka (Cancer) Moon sign

In the Vimshottari system a life moves through nine long periods, each ruled by one planet. The planet that rules the period sets the tone of those years: the areas of life that come forward, and the kind of effort that pays.

The Jupiter mahadasha lasts 16 years in full. Most people meet it partway through, so the part they live through can be shorter.

Jupiter stands for wisdom, teachers, children, growth and faith. Its period tends to widen life: learning, guidance, family growth and a stronger sense of meaning.

Counted from Cancer as the first house, Jupiter rules Sagittarius and Pisces, your 6th and 9th houses. During its period the matters of both come forward:

The 6th house is daily work, service, competition and debts. Its lord's period tends to bring hard work and rivals to deal with, and favours steady routines and paying down what you owe.

The 9th house is luck, teachers, father, beliefs and long journeys. Its lord's period tends to bring guidance, higher learning, pilgrimage and a wider view of life.

Jupiter counts Moon, the lord of Cancer, as a natural friend. That usually makes its period sit comfortably with your Moon sign: its themes arrive with support rather than friction.

Which mahadasha you are in, and when it began, depends on the Moon's nakshatra at the moment you were born, so it is personal to you. Even within the Jupiter mahadasha, where the planet sits in your own chart and the sub-periods inside it shape the years more than your Moon sign alone.