  One of main events on Rapanui before the cruel war (several wars) between the
Hanau Momoko and Hanau Eepe was the annual election of the bird-man. Plainly,
the local priest-astronomers, the descendants of immigrants from the Andean
region of South America, could predict the day of the vernal equinox not only
with the aid of the so-called "sun stones," but also counting the phases of the
moon. The elements of the mathematical calculations of the astronomers have
been deciphered. The astronomical basis of the Ahu Atanga (A Tanga) has been
decoded, too.
