Latitude lines are drawn horizontally across the globe whereas longitude lines are drawn vertically.
The Blue Nile begins at Lake Tana in Ethiopia and flows into Sudan from the southeast. The two rivers meet just north of the Sudanese capital of Khartoum. The northern section of the river flows north almost entirely through the Sudanese desert to Egypt, then ends in a large delta and flows into the Mediterranean Sea.
I think it is a geocentric model
I think its the equator
good luck,
