because they used them for jobs and relied on them to operate
I think rivers is one of them and maybe mountains
<span>The main reasons for adopting the new calendar included those that were secular in nature. The secular nature was that church was not as big of a part of people's lives, and this was reflected in the creation of the new calendar. The calendar replaced the Gregorian calendar which was religious in nature and did not focus on scientific ideals.</span>
