A mathematician who learned much about mathematics and the movements of the earth and moon.

Hipparchus

Explanation:

he measured the earth-moon distance accurately

world war i had a devastating effect on german-americans and their cultural heritage. up until that point   german-americans, as a group, had been spared much of the discrimination, abuse, rejection, collective mistrust experienced by so many different racial and ethnic groups in the history of the united states. indeed, over the years, they had been viewed as a well integrated and esteemed part of american society. all of this change with the outbreak of war.  

a.. a conflict between her competing identities.. apex