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
30Mar2020 03:59:07 PDT	mars	117.8	0.8	220421	0.89	70.4	-33.3
30Mar2020 03:59:07 PDT	jupiter	121.8	4.8	799881	0.99	76.0	-33.3
30Mar2020 03:59:07 PDT	saturn	116.5	0.9	1546261	1.00	69.5	-33.3
    

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


% sl_smrs 37.8 -122.4
30Mar2020:
Sunrise:  06:57 PDT (84.2°)
Sunset:   19:31 PDT (276.0°)
Moonrise: 10:42 PDT (61.8°)
Moonset:  00:43 PDT (297.0°)
    

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 mars (gibbous)
  start at 30Mar2020 03:58 PDT  b: 117.1° e: 0.8°  1.30° apart
  minsep at 30Mar2020 06:28 PDT  b: 144.8° e: 23.2°  1.21° apart
  end at 30Mar2020 06:28 PDT  b: 144.8° e: 23.2°  1.21° apart
saturn (full) and mars (gibbous)
  start at 31Mar2020 03:58 PDT  b: 117.4° e: 1.2°  0.94° apart
  minsep at 31Mar2020 05:58 PDT  b: 138.8° e: 20.0°  0.90° apart
  end at 31Mar2020 06:28 PDT  b: 145.3° e: 23.6°  0.97° apart
saturn (full) and mars (gibbous)
  start at 01Apr2020 03:58 PDT  b: 117.8° e: 1.6°  0.95° apart
  minsep at 01Apr2020 06:08 PDT  b: 141.4° e: 21.6°  0.90° apart
  end at 01Apr2020 06:28 PDT  b: 145.9° e: 23.9°  1.00° apart
    

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