Mangal (Mars) mahadasha for Dhanu (Sagittarius) 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 Mars mahadasha lasts 7 years in full. Most people meet it partway through, so the part they live through can be shorter.

Mars stands for energy, courage, drive, land and brothers. Its period tends to be active and direct: a time to start things, compete and defend what matters, best used with a cool head.

Counted from Sagittarius as the first house, Mars rules Aries and Scorpio, your 5th and 12th houses. During its period the matters of both come forward:

The 5th house is children, study, creativity and romance. Its lord's period tends to favour learning, creative work, matters of children and decisions taken with a clear mind.

The 12th house is spending, rest, time abroad and letting go. Its lord's period tends to bring expenses, travel or a stay away from home, and a pull towards quiet and spiritual practice.

Mars counts Jupiter, the lord of Sagittarius, 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 Mars mahadasha, where the planet sits in your own chart and the sub-periods inside it shape the years more than your Moon sign alone.