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 -refraction 37.8 -122.4 | sl_find 'elev>0'
# datetime		object	bearing	elev	dist	full	sunsep	sunelev
27Nov2020 12:59:29 PST	sun	196.5	29.1	147587	1.00	0.0	29.1
27Nov2020 12:59:29 PST	mercury	210.6	28.5	198920	0.93	12.3	29.1
27Nov2020 12:59:29 PST	venus	228.1	25.2	211808	0.88	28.3	29.1
27Nov2020 12:59:29 PST	jupiter	142.3	20.8	851937	0.99	49.5	29.1
27Nov2020 12:59:29 PST	saturn	139.5	19.9	1582151	1.00	52.3	29.1
    

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


% sl_smrs 37.8 -122.4
27Nov2020:
Sunrise:  07:03 PST (116.6°)
Sunset:   16:51 PST (243.2°)
Moonrise: 15:39 PST (75.5°)
Moonset:  04:24 PST (281.8°)
    

And here are the close celestial encounters for the next few days:


% sl_data -duration 3d -interval 10m -planets -refraction 37.8 -122.4 | sl_conjunctions
saturn (full) and jupiter (full)
  start at 27Nov2020 19:13 PST  b: 230.8° e: 12.0°  2.70° apart
  minsep at 27Nov2020 20:03 PST  b: 239.3° e: 4.2°  2.69° apart
  end at 27Nov2020 20:13 PST  b: 240.9° e: 2.5°  2.69° apart
saturn (full) and jupiter (full)
  start at 28Nov2020 17:23 PST  b: 208.7° e: 25.6°  2.69° apart
  minsep at 28Nov2020 20:13 PST  b: 241.4° e: 2.0°  2.47° apart
  end at 28Nov2020 20:13 PST  b: 241.4° e: 2.0°  2.47° apart
saturn (full) and jupiter (full)
  start at 29Nov2020 17:23 PST  b: 209.4° e: 25.3°  2.62° apart
  minsep at 29Nov2020 20:03 PST  b: 240.4° e: 3.1°  2.33° apart
  end at 29Nov2020 20:13 PST  b: 242.0° e: 1.5°  2.33° apart
    

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