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
29Sep2016 10:00:07 PDT	sun	123.8	32.0	149827	1.00	0.0	32.0
29Sep2016 10:00:07 PDT	moon	131.5	44.6	394	0.02	14.0	32.0
29Sep2016 10:00:07 PDT	mercury	133.5	48.2	146744	0.54	17.8	32.0
29Sep2016 10:00:07 PDT	venus	111.3	3.9	206896	0.86	30.5	32.0
29Sep2016 10:00:07 PDT	jupiter	124.0	34.8	965211	1.00	2.8	32.0
    

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


% sl_smrs 37.8 -122.4
29Sep2016:
Sunrise:  07:04 PDT (92.8°)
Sunset:   18:54 PDT (266.8°)
Moonrise: 05:47 PDT (84.4°)
Moonset:  18:30 PDT (273.0°)
    

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
mercury (half) and moon (crescent)
  start at 29Sep2016 05:55 PDT  b: 85.6° e: 2.1°  2.31° apart
  minsep at 29Sep2016 05:55 PDT  b: 85.6° e: 2.1°  2.31° apart
  end at 29Sep2016 06:35 PDT  b: 91.8° e: 9.8°  2.60° apart
    

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