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
20May2022 16:06:36 PDT	sun	258.6	47.3	151388	1.00	0.0	47.3
20May2022 16:06:36 PDT	mercury	256.5	48.0	82642	0.00	1.6	47.3
20May2022 16:06:36 PDT	venus	270.6	9.8	171114	0.74	38.9	47.3
    

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


% sl_smrs 37.8 -122.4
20May2022:
Sunrise:  05:56 PDT (63.6°)
Sunset:   20:17 PDT (296.6°)
Moonrise: 00:46 PDT (123.2°)
Moonset:  10:17 PDT (238.2°)
    

And here are the close celestial encounters for the next week:


% sl_data -start 20May2022 -duration 7d -interval 5m -planets -refraction 37.8 -122.4 | sl_conjunctions
jupiter (full) and mars (gibbous)
  start at 25May2022 03:10 PDT  b: 91.3° e: 1.1°  2.26° apart
  minsep at 25May2022 04:50 PDT  b: 107.3° e: 19.9°  2.22° apart
  end at 25May2022 05:25 PDT  b: 113.8° e: 26.5°  2.26° apart
jupiter (full) and mars (gibbous)
  start at 26May2022 03:05 PDT  b: 90.7° e: 0.7°  1.82° apart
  minsep at 26May2022 05:05 PDT  b: 110.3° e: 23.3°  1.67° apart
  end at 26May2022 05:25 PDT  b: 114.0° e: 26.9°  1.70° apart
venus (gibbous) and moon (crescent)
  start at 26May2022 16:20 PDT  b: 274.3° e: 7.9°  2.61° apart
  minsep at 26May2022 16:55 PDT  b: 279.6° e: 1.6°  2.21° apart
  end at 26May2022 16:55 PDT  b: 279.6° e: 1.6°  2.21° apart
    

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