Will give 10 points

which of these happened during the century that followed the pax romana?

the roman empire expanded further, reaching hindu kush.

the roman military led a major revolt against the emperor and many citizens were killed.

roman leaders invaded territories outside the roman empire.

rome went through many leaders as men fought for power over the empire.

answer: the time zones used to be whatever the local authority wanted them to be. one town might have 6am whenever the sun came up and another town had 6am 10 minutes later.  

the trains had a hard time when their orders said to be at a certain point at 6am.  

6am, but who's 6am.  

the railroads got together and set the time zones more or less along the longitude lines across the country.

explanation:

declare war, appoint military officers, sign treaties, make alliances

copernicus finished the first manuscript of his book, "de revolutionibus orbium coelestium" ("on the revolutions of the heavenly spheres") in 1532. in it, copernicus established that the planets orbited the sun rather than the earth. he laid out his model of the solar system and the path of the planets.