sightliner - find sight lines for the sun and moon

Not quite released yet.

Here are the current positions of the celestial objects, above the horizon as seen from San Francisco:


% sl_data -planets -num 1 37.8 -122.4 | sl_find 'elev>0'
# datetime		object	bearing	elev	dist	full	sunsep	sunelev
21Aug2017 07:11:13 PDT	sun	80.3	7.0	151330	1.00	0.0	7.0
21Aug2017 07:11:13 PDT	moon	80.8	8.3	370	0.00	1.4	7.0
21Aug2017 07:11:13 PDT	venus	93.1	39.2	191735	0.81	34.2	7.0
21Aug2017 07:11:13 PDT	mars	81.6	15.1	396362	1.00	8.2	7.0
    

Here are today's sun/moon rise/set times and bearings for San Francisco:


% sl_smrs 37.8 -122.4
21Aug2017:
Sunrise:  06:31 PDT (74.2°)
Sunset:   19:54 PDT (285.6°)
Moonrise: 06:22 PDT (73.6°)
Moonset:  20:05 PDT (283.7°)
    

And here are the close celestial encounters for the next few days:


% sl_data -duration 3d -interval 10m -planets 37.8 -122.4 | sl_conjunctions
moon (crescent) and sun (partial solar eclipse)
  start at 21Aug2017 09:06 PDT  b: 98.2° e: 29.9°  0.51° apart
  minsep at 21Aug2017 09:56 PDT  b: 107.3° e: 39.3°  0.10° apart
  end at 21Aug2017 11:26 PDT  b: 130.3° e: 54.8°  0.46° apart
    

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