Both full and new moon days are observed as yoga holidays in the Ashtanga Yoga tradition.

What is the reasoning behind this?

Like all things of a watery nature (human beings are about 70% water),

we are affected by the phases of the moon. The phases of the moon are

determined by the moon’s relative position to the sun. Full moons occur when they are in

opposition and new moons when they are in conjunction. Both sun and moon exert a gravitational

pull on the earth. Their relative positions create different energetic experiences that can be compared

to the breath cycle. The full moon energy corresponds to the end of inhalation when the force of prana

is greatest. This is an expansive, upward moving force that makes us feel energetic and emotional,

but not well grounded. The Upanishads state that the main prana lives in the head. During the full

moon we tend to be more headstrong.

The new moon energy corresponds to the end of exhalation when the force of apana is greatest.

Apana is a contracting, downward moving force that makes us feel calm and grounded, but dense

and disinclined towards physical exertion.

The Farmers Almanac recommends planting seeds at the new moon when the rooting force is

strongest and transplanting at the full moon when the flowering force is strongest.

Practicing Ashtanga Yoga over time makes us more attuned to natural cycles. Observing moon days

is one way to recognize and honor the rhythms of nature so we can live in greater harmony with it.