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
23Nov2014 22:53:31 PST	jupiter	71.8	0.8	755935	0.99	99.6	-68.0
    

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


% sl_smrs 37.8 -122.4
23Nov2014:
Sunrise:  06:59 PST (115.6°)
Sunset:   16:53 PST (244.4°)
Moonrise: 08:00 PST (113.6°)
Moonset:  18:21 PST (246.0°)
    

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
saturn (full) and mercury (full)
  start at 25Nov2014 06:30 PST  b: 113.8° e: 0.5°  1.70° apart
  minsep at 25Nov2014 06:30 PST  b: 113.8° e: 0.5°  1.70° apart
  end at 25Nov2014 06:30 PST  b: 113.8° e: 0.5°  1.70° apart
    

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