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
28Feb2021 02:19:34 PST	moon	205.6	55.9	362	0.98	164.8	-49.9
    

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


% sl_smrs 37.8 -122.4
28Feb2021:
Sunrise:  06:42 PST (99.2°)
Sunset:   18:02 PST (261.0°)
Moonrise: 19:54 PST (87.4°)
Moonset:  07:50 PST (276.5°)
    

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
jupiter (full) and mercury (half)
  start at 01Mar2021 05:39 PST  b: 111.2° e: 1.2°  2.30° apart
  minsep at 01Mar2021 05:49 PST  b: 112.8° e: 2.8°  2.30° apart
  end at 01Mar2021 06:09 PST  b: 116.0° e: 6.2°  2.36° apart
jupiter (full) and mercury (half)
  start at 02Mar2021 05:39 PST  b: 111.5° e: 1.5°  1.72° apart
  minsep at 02Mar2021 06:09 PST  b: 116.3° e: 6.6°  1.72° apart
  end at 02Mar2021 06:09 PST  b: 116.3° e: 6.6°  1.72° apart
    

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