tissot going over the North Pole

Sorry if this is a known bug, but I could not find it in this repository, I think I might have seen it in Matplotlib:

When using tissot to plot the theoretical field of view of a satellite looking down to Earth, a ValueError is encountered if the tissot polygon crosses the North Pole. It does not happen on the South Pole.

> ValueError: undefined inverse geodesic (may be an antipodal point)

Code snipplet below. I installed Basemap (v1.2.0) through pip.

```
import matplotlib.pyplot as plt
from mpl_toolkits.basemap import Basemap
import math

earth_radius = 6371000. # m
fig = plt.figure()
m = Basemap(projection='cyl', resolution='l',
llcrnrlat=-90, urcrnrlat=90,
llcrnrlon=-180, urcrnrlon=180)

# define the position of the satellite
position = [300000., 75., 0.] # altitude, latitude, longitude

# radius needed by the tissot method
radius = math.degrees(math.acos(earth_radius / (earth_radius + position[0])))
m.tissot(position[2], position[1], radius, 100, facecolor='tab:blue', alpha=0.3) # longitude, latitude
m.scatter(position[2], position[1], marker='*', c='tab:red')

plt.show()
```

Start by running the reported Python snippet with Basemap 1.2.0 and the tissot call that crosses the North Pole. Trace the tissot path and its geodesic calculation to identify why the pole case raises ValueError. Done means the North Pole example completes without error while the existing South Pole behavior remains intact.

Written by the indexing model from the issue text.