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
    

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


% sl_smrs 37.8 -122.4
12May2021:
Sunrise:  06:02 PDT (65.9°)
Sunset:   20:10 PDT (294.2°)
Moonrise: 06:39 PDT (65.3°)
Moonset:  21:18 PDT (297.2°)
    

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
venus (full) and moon (crescent)
  start at 12May2021 20:42 PDT  b: 292.8° e: 5.2°  1.74° apart
  minsep at 12May2021 20:42 PDT  b: 292.8° e: 5.2°  1.74° apart
  end at 12May2021 21:02 PDT  b: 295.7° e: 1.9°  1.83° apart
    

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