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
07Dec2019 01:12:10 PST	moon	261.0	14.6	400	0.78	122.7	-68.4
    

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


% sl_smrs 37.8 -122.4
07Dec2019:
Sunrise:  07:12 PST (118.5°)
Sunset:   16:50 PST (241.5°)
Moonrise: 14:30 PST (83.5°)
Moonset:  02:33 PST (273.4°)
    

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 venus (gibbous)
  start at 09Dec2019 17:22 PST  b: 224.0° e: 15.0°  2.40° apart
  minsep at 09Dec2019 18:02 PST  b: 231.2° e: 9.2°  2.32° apart
  end at 09Dec2019 18:42 PST  b: 237.8° e: 2.7°  2.45° apart
    

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