Book,  Chapter

1        I,  VI  |       making in all an entire circumference of about 171 miles.~“What
2        I,  XXIV|   than a quarter of a mile in circumference; and the conclusion was
3       II,  III |       points to determine the circumference; so in ascertaining the
4       II,  IV  |          I estimate the total circumference of the equator to be about
5       II,  IV  |       speaking to himself, “a circumference of 1,400 miles would give
6       II,  IV  | surface of a sphere? Multiply circumference by diameter.”~“Right!” cried
7       II,  IV  |       be done by this time.”~“Circumference, 1,400; diameter, 450; area
8       II,  X   |       of miles in length. His circumference is about 220,000 miles;
9       II,  XI  |     effect of refraction, its circumference sharply defined against