timelib.calendar_tuple fails on array inputs

[jrs65]

I'm getting an Exception thrown when I try to use timelib.calendar_tuple with an array.

>>> import numpy as np
>>> from skyfield import timelib                                                                                         
>>> jd_array = 2440587.5 + np.arange(10.0)                                                                                                            
>>> years, months, days, hours, minutes, seconds = timelib.calendar_tuple(jd_array)
Traceback (most recent call last):
  File "<stdin>", line 2, in <module>
  File "/bg01/homescinet/k/krs/jrs65/sfdev/python-skyfield/skyfield/timelib.py", line 575, in calendar_tuple
    whole = whole.astype(whole)
TypeError: data type not understood

I think the issue is that the offending line (skyfield/timelib.py:575) has a slight typo and that it should be changed from:

whole = whole.astype(whole)

to

whole = whole.astype(int)

Making that change allows it to work correctly on array inputs, and doesn't cause any regressions in the unit tests.

I'll try and put together a PR for it later on today.

[jrs65]

A quick comment...

This issue crops up when calling Time.tt_calendar() or Time.tai_calendar(), e.g.

tv = ts.utc(range(2000, 2010))
tv.tt_calendar()  # Fails

[brandon-rhodes]

Fixed in 10d7a89.