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
27Aug2016 13:30:09 PDT	sun	190.0	61.5	151117	1.00	0.0	61.5
27Aug2016 13:30:09 PDT	moon	267.9	32.9	374	0.22	55.8	61.5
27Aug2016 13:30:09 PDT	mercury	156.8	46.8	112102	0.31	24.0	61.5
27Aug2016 13:30:09 PDT	venus	153.3	51.3	231345	0.92	22.3	61.5
27Aug2016 13:30:09 PDT	jupiter	153.2	51.2	952868	1.00	22.4	61.5
    

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


% sl_smrs 37.8 -122.4
27Aug2016:
Sunrise:  06:36 PDT (76.9°)
Sunset:   19:45 PDT (282.8°)
Moonrise: 02:01 PDT (66.6°)
Moonset:  16:30 PDT (293.2°)
    

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 27Aug2016 20:11 PDT  b: 267.9° e: 6.0°  0.28° apart
  minsep at 27Aug2016 20:21 PDT  b: 269.4° e: 4.0°  0.14° apart
  end at 27Aug2016 20:41 PDT  b: 272.5° e: 0.1°  0.22° apart
jupiter (full) and venus (full)
  start at 28Aug2016 20:11 PDT  b: 267.9° e: 5.6°  1.25° apart
  minsep at 28Aug2016 20:21 PDT  b: 269.4° e: 3.6°  1.16° apart
  end at 28Aug2016 20:31 PDT  b: 270.9° e: 1.6°  1.25° apart
jupiter (full) and venus (full)
  start at 29Aug2016 20:11 PDT  b: 267.9° e: 5.1°  2.14° apart
  minsep at 29Aug2016 20:11 PDT  b: 267.9° e: 5.1°  2.14° apart
  end at 29Aug2016 20:31 PDT  b: 270.9° e: 1.1°  2.28° apart
    

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