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
28Mar2020 04:46:24 PDT	mars	125.3	8.2	222779	0.89	69.9	-26.1
28Mar2020 04:46:24 PDT	jupiter	128.7	11.3	804455	0.99	74.3	-26.1
28Mar2020 04:46:24 PDT	saturn	123.0	7.7	1550832	1.00	67.7	-26.1
    

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


% sl_smrs 37.8 -122.4
28Mar2020:
Sunrise:  07:00 PDT (85.2°)
Sunset:   19:29 PDT (275.0°)
Moonrise: 09:28 PDT (69.6°)
Moonset:  23:43 PDT (293.1°)
    

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
saturn (full) and mars (gibbous)
  start at 28Mar2020 04:08 PDT  b: 118.1° e: 1.6°  2.38° apart
  minsep at 28Mar2020 06:08 PDT  b: 139.6° e: 20.1°  2.25° apart
  end at 28Mar2020 06:38 PDT  b: 146.1° e: 23.7°  2.39° apart
saturn (full) and mars (gibbous)
  start at 29Mar2020 03:58 PDT  b: 116.8° e: 0.3°  1.81° apart
  minsep at 29Mar2020 05:38 PDT  b: 134.0° e: 16.4°  1.73° apart
  end at 29Mar2020 06:28 PDT  b: 144.4° e: 22.9°  1.80° apart
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
    

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