In Egyptian Mythology, Egyptian God Aker/Akar ( also known as Akeru, Akerui meaning “two Akers” ), was one of the earliest gods worshipped before any other known Egyptian gods on earth. Ancient Egyptian god Aker guarded the sunrise and sunset, and the passage of Egyptian God Ra’s solar boat on its daily journey across the sky.
Aker was depicted as two opposing sitting male lions, sometimes with human heads, facing away from each other. Between them was the sign of Akhet for the horizon showing the sun setting or rising in the mountains.
As the Egyptian believed that the morning and evening were guarded by Egyptian god Aker, twin statues of lions were sometimes placed at the doors of palaces and tomb. This was to guard their palaces and tombs from other evil spirits and other malevolent beings. These practices were later on adopted by the Romans and Greeks.
The Guard of the Underworld.
Ancient Egyptian mythologist believed that during the night, the sun exited the earth and journeyed through the tunnel that existed earth. Its entry through the tunnel caused the night, and its emergence brought the day once more. Each end of the tunnel was guarded by the lion god, and the two guards were called Akeru.
‘Yesterday’ and ‘Today’
In the later period of Egyptian theology, the two lions making up the Akeru were named Sef and Tuau respectively, which means ‘yesterday’ and ‘today’.