At what time was Daniel's second vision given?

Answer

"In the first year of Belshazzar king of Babylon Daniel had a dream and visions of his head upon his bed:
then he wrote the dream, and told the sum of the matters." Dan. 7:1.
NOTE - That is, in the first year of Belshazzar's office as associate king with his father
Nabonadius, or 540 BC.

What is a \"wind of doctrine\"?
What change did Daniel see take place in these horns?
How was the opening of the judgment to be made known to the world?
Through what is the knowledge of sin obtained?
How long was the Sabbath to be a sign of the true God?
How universal is the worship of this power to become?
By what authority was Sunday Sabbath-keeping instituted?

Questions & Answers are from the book Bible Readings for the Home Circle