What is "brahmamuhurtha"

Brahma muhurta (time of Brahma) is a period (muhurta) one and a half hours before sunrise or more precisely 1Hr 36 Mins before sunrise. i.e. 96 Minutes = 2 Muhūrta or 4 Ghaṭīkā,and each Muhurta lasting for 48 minutes. Literally meaning "The Creator's Hour", it is traditionally the last phase or muhurta of the night and is considered an auspicious time for all practices of yoga and most appropriate for meditation, worship or any other religious practice.