Answer:
The use of the calendar
Explanation:
They all used the calendar to predict eclipses, schedule religious ceremonies, and determine when to plant/harvest crops, and go off to war.
The two main reasons why Douglas opposed John Brown's plan to raid Harper's Ferry were that he was sure the plan would fall and lead to many black deaths, and he thought he would hurt the abolition movement by causing a backlash.
Full because it is exactly opposite to the sun.
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