Supreme Reflection Day, on the third quarter on the 23rd of the lunar month, in the waning period of the moon, is Supreme Day of Reflection, a

day of quiet and meditation, ideal for Mahamudra and Dzogchen practices, mindfulness practices and quiet Sutra recitation. It is also special to the Vajra Family of Akshobhya Buddha as the Buddha of Mirror-Like Wisdom.

Akshobhya Buddha Mantra:

About Akshobhya Buddha with origin story, and his Sadhana (at 16 minutes in): 

Other practice for Reflection Day are recitation of the Heart Sutra, reflecting on the Perfection of Wisdom:

In Sanskrit:

Recite along in English: