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
    

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


% sl_smrs 37.8 -122.4
21Oct2014:
Sunrise:  07:24 PDT (103.1°)
Sunset:   18:24 PDT (256.7°)
Moonrise: 05:16 PDT (92.4°)
Moonset:  17:18 PDT (265.1°)
    

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 23Oct2014 13:58 PDT  b: 200.4° e: 38.5°  0.44° apart
  minsep at 23Oct2014 14:48 PDT  b: 214.4° e: 33.9°  0.26° apart
  end at 23Oct2014 16:18 PDT  b: 234.7° e: 21.5°  0.44° apart
    

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