Full of fish dating
In the 1970s the "Jesus Fish" started to be used as an icon of modern Christianity.
Callistus that the fish symbol was known to Christians much earlier.
The full moon is the lunar phase when the Moon appears fully illuminated from Earth's perspective.
This occurs when Earth is located directly between the Sun and the Moon (more exactly, when the ecliptic longitudes of the Sun and Moon differ by 180°).
The first appearances of the ichthys symbol in Christian art and literature date to the 2nd century AD.
The symbol's use among Christians had become popular by the late 2nd century, and its use spread widely in the 3rd and 4th centuries.