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
25Aug2016 01:10:36 PDT	moon	77.4	8.9	370	0.48	86.9	-41.6
    

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


% sl_smrs 37.8 -122.4
25Aug2016:
Sunrise:  06:35 PDT (76.1°)
Sunset:   19:48 PDT (283.7°)
Moonrise: 00:18 PDT (69.9°)
Moonset:  14:34 PDT (291.7°)
    

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
jupiter (full) and venus (full)
  start at 25Aug2016 20:15 PDT  b: 268.6° e: 5.9°  1.87° apart
  minsep at 25Aug2016 20:15 PDT  b: 268.6° e: 5.9°  1.87° apart
  end at 25Aug2016 20:35 PDT  b: 271.8° e: 2.0°  1.88° apart
jupiter (full) and venus (full)
  start at 26Aug2016 20:15 PDT  b: 268.7° e: 5.5°  0.89° apart
  minsep at 26Aug2016 20:25 PDT  b: 270.2° e: 3.5°  0.85° apart
  end at 26Aug2016 20:35 PDT  b: 271.7° e: 1.5°  0.85° apart
jupiter (full) and venus (full)
  start at 27Aug2016 20:15 PDT  b: 268.6° e: 5.0°  0.14° apart
  minsep at 27Aug2016 20:15 PDT  b: 268.6° e: 5.0°  0.14° apart
  end at 27Aug2016 20:35 PDT  b: 271.7° e: 1.1°  0.28° apart
    

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