Is the prime meridian at 0 degrees latitude 0 degrees longitude or 180 degrees latitude

0 degrees latitude . . .
No.  That's the equator.

0 degrees longitude . . .
Yes.  That's the Prime Meridian.

180 degrees latitude . . .
No.  That doesn't even exist.  The greatest possible latitude is 90 degrees.

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Nestor foreshadows the plan of the suitors to kill telemachus through his account of what happened to agamemnon who was murdered by people around him. despite this telemachus was reassured that his voyage was going to be safe with the of athena.