gistfile1.txt

unimoon is a function
unimoon () 
{ 
    local pha=(🌑 🌒 🌓 🌔 🌕 🌖 🌗 🌘);
    local cyc=2551392 adj=-604800;
    local now pos num;
    now="${1:-$(printf "%(%s)T\n" "-1")}";
    pos=$(( (now + adj) % cyc ));
    num=$(( pos / ( cyc / ${#pha[@]} ) ));
    printf "%s\n" "${pha[$num]}"
}