Generating paris_moscow grid (ground stations)

[afiasma]

Hi,
I need your help please regarding the program "generate_paris_moscow_grid.py".
I need to know how did u make the choice of (num_latitude/ num_longitude) in order to choose the grid size.
In fact, I have used the world map with a grid and tried to count the num_latitude/ num_longitude between pairs and Moscow and I have found :
num_latitude = 7+2 = 9
num_longitude = 2 +2 =4

it's not the same result that I found in the program "generate_paris_moscow_grid.py" (num_latitude = 8 /num_longitude =4
can you please help me to understand how I can find them?
Thanks in advance.