According to a legend, when the gates of heaven were first opened, the powerful light of angels illuminated the whole world.
The Dawn of the Angels is said to occur before sunrise.
The dance of angels at dawn takes place as atonement for human sins. According to this legend, when people worship God or regret their sins, angels dance and this dance helps people to get their sins forgiven.
With the sunrise, the angels complete their mission and return to heaven.