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
11May2021:
Sunrise:  06:03 PDT (66.3°)
Sunset:   20:09 PDT (293.9°)
Moonrise: 06:09 PDT (70.5°)
Moonset:  20:20 PDT (292.7°)
    

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 20:39 PDT  b: 292.4° e: 5.7°  1.74° apart
  minsep at 12May2021 20:39 PDT  b: 292.4° e: 5.7°  1.74° apart
  end at 12May2021 21:09 PDT  b: 296.8° e: 0.8°  2.02° apart
    

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