Answer:
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<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>
Explanation: LAW
The necessity of fighting off invading groups was one aspect of the Roman Empire that continued into the Byzantine Empire. The Byzantine Empire, a very powerful and vast civilisation, emerged after the Roman Empire during Late Antiquity and the Middle Ages. Constantinople became its capital.