SUN_MOON - NORTH POLE

When the geographic location is latitude 90, i.e. the North Pole, I usually get an error:
```
line 57, in quad
ZeroDivisionError: divide by zero
```
The problem is in this line:
```
xe = -b / (2 * a)
```
In the file
```
sun_moon.py
```

This problem occurs in the MicroPython controller and does not occur on a regular computer