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
03Aug2015 22:22:01 PDT	saturn	216.4	25.8	1444356	1.00	106.7	-21.4
    

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


% sl_smrs 37.8 -122.4
03Aug2015:
Sunrise:  06:15 PDT (67.0°)
Sunset:   20:16 PDT (292.8°)
Moonrise: 22:31 PDT (88.5°)
Moonset:  10:02 PDT (268.5°)
    

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
jupiter (full) and mercury (gibbous)
  start at 05Aug2015 20:45 PDT  b: 285.1° e: 2.1°  1.94° apart
  minsep at 05Aug2015 20:55 PDT  b: 286.7° e: 0.2°  1.84° apart
  end at 05Aug2015 20:55 PDT  b: 286.7° e: 0.2°  1.84° apart
    

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