Chandra (Moon) mahadasha for Simha (Leo) 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 Moon mahadasha lasts 10 years in full. Most people meet it partway through, so the part they live through can be shorter.

The Moon stands for the mind, feelings, the mother and home. Its period tends to make family, comfort and moods more central, and brings more contact with people and the public.

Counted from Leo as the first house, Moon rules Cancer, your 12th house. During its period the matters of that house come forward:

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.

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