The opinions and prejudice of an author in writing.
I believe that those two elements greatly affect bias in history because we can never be 100% sure of everything that (may have) happened in history (especially farther in the past), so opinion can affect a historian's writings. Also, everyone is prone to some sort of prejudice, so this can also affect history.
To make laws while other laws are in the making of others
There are 180° degree of longitude on each side of the prime meridians
There’s no image but if there is something about an ice skater turning the rink then that is the answer