How did Eratosthenes estimate the size of Earth in 240 B.C.?
A) by observing the duration of a solar eclipse
B) by measuring the size of Earth's shadow on the Moon in a lunar eclipse
C) by comparing the maximum altitude of the Sun in two cities at different latitudes on the summer solstice
D) by sending fleets of ships around Earth
E) We don't know how he did it since all his writings were destroyed.
C
You might also like to view...
When a moving object's velocity doubles, its kinetic energy increases by a factor of ______________
Fill in the blank(s) with correct word
Drought conditions and high temperatures over the Great Plains are most likely caused by a
A) continental tropical air mass. B) continental polar air mass. C) maritime tropical air mass. D) maritime polar air mass.
No nuclide with an atomic number greater than ______________ is stable
Fill in the blank(s) with correct word
A particular gray body surface has absorptivity of 0.35 and reflectivity of 0.45. What is its emissivity and transmissivity?
What will be an ideal response?