The Greater Fire and Water Alchemy practice works at the solar plexus and the level of the planet Earth. We’ve got the planet Earth holding the center and then the yin and yang are the energies of the Sun and the Moon.
The Sun and the Moon deal with our perception of time, our days, our nights, and the seasons. At this level, the practice also deals with our ancestors. Balancing energies at the level of the greater water and fire help with any issues with our ancestors, any genetic things you may have inherited, emotionally or physically.
To start, visualize the earth at the solar plexus. Then, we can we the Golden Sun below the Silver (or black) moon at the solar plexus; like fire below boiling water.
The Alchemist’s Tao Te Ching: Transforming Your Lead Into Gold https://www.amazon.com/dp/1718636970/ref=cm_sw_r_cp_api_i_lIGqEbX7Z7NFG