Sunset computation broken beyond polar circle - raise exception.

[vvasuki]

The code was working yesterday - #10 . After I did some non-functional changes (renaming functions, reformatting code and the like), I faced a brentq error, which I fixed. But now I get the below:

No precomputed data available. Computing panchangam... DEBUG: 2017-12-15 15:03:57,622 {spatio_temporal.py:161}: 0.0 
DEBUG: 2017-12-15 15:03:57,622 {spatio_temporal.py:162}: 10 
DEBUG: 2017-12-15 15:03:57,623 {spatio_temporal.py:163}: -0.634040778754029 
DEBUG: 2017-12-15 15:03:57,623 {spatio_temporal.py:164}: 0.5376589639327491 
ERROR: 2017-12-15 15:03:57,769 {spatio_temporal.py:246}: 11 
[2017-12-15 15:03:57,770] ERROR in app: Exception on /jyotisha/v1/calendars/coordinates/80:16:12/13:05:24/years/2017 [GET]
Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1612, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python3.6/dist-packages/flask/app.py", line 1598, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/usr/local/lib/python3.6/dist-packages/flask_restplus/api.py", line 313, in wrapper
    resp = resource(*args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/flask/views.py", line 84, in view
    return self.dispatch_request(*args, **kwargs)
  File "/usr/local/lib/python3.6/dist-packages/flask_restplus/resource.py", line 44, in dispatch_request
    resp = meth(*args, **kwargs)
  File "/home/vvasuki/jyotisha/jyotisha/rest_api/api_v1.py", line 40, in get
    panchangam = scripts.get_panchangam(city=city, year=int(year), script=args['encoding'])
  File "/home/vvasuki/jyotisha/jyotisha/panchangam/scripts/__init__.py", line 32, in get_panchangam
    panchangam.compute_angams(computeLagnams=computeLagnams)
  File "/home/vvasuki/jyotisha/jyotisha/panchangam/spatio_temporal.py", line 247, in compute_angams
    raise (ValueError('Dec 31 does not appear to be Dhanurmasa!'))
ValueError: Dec 31 does not appear to be Dhanurmasa!

I fancy that karthik may be able to deduce what went wrong faster. In the meantime, I'll try to shift from doctests to pytest so as to enable continuous automated testing.

[vvasuki]

From the logs, it seems that the following call is returning 0:

  jd_sunset = swe.rise_trans(jd_start=jd_start, body=swe.SUN, lon=city.longitude,
                             lat=city.latitude, rsmi=swe.CALC_SET | swe.BIT_DISC_CENTER)[1][0]

[vvasuki]

As astrorigin/pyswisseph#13 shows, this is false alarm. Leaving thread open so as to raise an exception for illegal input.

[karthikraman]

Fixed vide 171b707