ValueError with example code

[Hugo]

Windows 7, Python 2.7.11, Astral

The example code at https://pythonhosted.org/astral/#example works in IDLE:

```
Python 2.7.11 (v2.7.11:6d1b6a68f775, Dec 5 2015, 20:40:30) [MSC v.1500 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import datetime
>>> from astral import Astral
>>> city_name = 'London'
>>> a = Astral()
>>> a.solar_depression = 'civil'
>>> city = a[city_name]
>>> print('Information for %s/%s\n' % (city_name, city.region))
Information for London/England

>>> timezone = city.timezone
>>> print('Timezone: %s' % timezone)
Timezone: Europe/London
>>> print('Latitude: %.02f; Longitude: %.02f\n' % \
... (city.latitude, city.longitude))
Latitude: 51.50; Longitude: -0.12

>>> sun = city.sun(date=datetime.date(2009, 4, 22), local=True)
>>> print('Dawn: %s' % str(sun['dawn']))
Dawn: 2009-04-22 05:12:06+01:00

```

But when I

[Hugo (hugovk)]

Accidentally submitted that too early. I can't see a way to edit it, so please ignore and I'll resubmit.