This is something I have just recently learned about, and know not much of but am certainly interested in exploring.

Moon Salutations are related to the lower chakras (Root and Sacral) therefore relates to opening and grounding the hip region. This differs from Sun Salutations, as they relate to opening the heart chakra.

The Root Chakra relates to the Earth element, and the Sacral relates to the Water element.

Moon salutations would become a useful part of daily practice. Sun salutations in the morning, Moon salutations in the evening.

As I explore these further I'll be posting more info here about poses and working with the energy.