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
18Jun2019 18:08:31 PDT	sun	280.4	26.0	151997	1.00	0.0	26.0
18Jun2019 18:08:31 PDT	mercury	264.0	46.8	136218	0.48	24.5	26.0
18Jun2019 18:08:31 PDT	venus	287.9	12.3	246909	0.96	15.3	26.0
18Jun2019 18:08:31 PDT	mars	264.0	46.5	376288	0.98	24.3	26.0
    

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


% sl_smrs 37.8 -122.4
18Jun2019:
Sunrise:  05:48 PDT (59.2°)
Sunset:   20:34 PDT (300.9°)
Moonrise: 21:59 PDT (118.7°)
Moonset:  06:58 PDT (241.1°)
    

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
mars (full) and mercury (half)
  start at 18Jun2019 21:00 PDT  b: 288.9° e: 13.2°  0.32° apart
  minsep at 18Jun2019 21:00 PDT  b: 288.9° e: 13.2°  0.32° apart
  end at 18Jun2019 22:10 PDT  b: 299.0° e: 0.6°  0.36° apart
saturn (full) and moon (full)
  start at 18Jun2019 22:10 PDT  b: 120.5° e: 1.9°  1.70° apart
  minsep at 18Jun2019 22:10 PDT  b: 120.5° e: 1.9°  1.70° apart
  end at 19Jun2019 02:00 PDT  b: 167.6° e: 28.9°  2.95° apart
mars (full) and mercury (half)
  start at 19Jun2019 21:00 PDT  b: 288.7° e: 13.0°  0.84° apart
  minsep at 19Jun2019 21:40 PDT  b: 294.4° e: 5.7°  0.78° apart
  end at 19Jun2019 22:10 PDT  b: 298.9° e: 0.3°  0.86° apart
mars (full) and mercury (half)
  start at 20Jun2019 21:00 PDT  b: 288.6° e: 12.9°  1.33° apart
  minsep at 20Jun2019 21:00 PDT  b: 288.6° e: 12.9°  1.33° apart
  end at 20Jun2019 22:00 PDT  b: 297.2° e: 1.9°  1.44° apart
    

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