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
01Jul2015 16:12:58 PDT	sun	262.1	49.1	152086	1.00	0.0	49.1
01Jul2015 16:12:58 PDT	mercury	274.0	30.3	147175	0.55	20.8	49.1
01Jul2015 16:12:58 PDT	venus	182.4	66.8	76103	0.33	42.2	49.1
01Jul2015 16:12:58 PDT	mars	267.0	45.5	386583	1.00	4.9	49.1
01Jul2015 16:12:58 PDT	jupiter	182.8	67.2	910501	1.00	42.0	49.1
    

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


% sl_smrs 37.8 -122.4
01Jul2015:
Sunrise:  05:52 PDT (59.6°)
Sunset:   20:35 PDT (300.4°)
Moonrise: 20:14 PDT (113.3°)
Moonset:  05:40 PDT (246.3°)
    

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 venus (crescent)
  start at 01Jul2015 21:06 PDT  b: 272.6° e: 21.1°  0.66° apart
  minsep at 01Jul2015 21:16 PDT  b: 274.1° e: 19.1°  0.58° apart
  end at 01Jul2015 22:46 PDT  b: 287.4° e: 1.7°  0.63° apart
jupiter (full) and venus (crescent)
  start at 02Jul2015 21:06 PDT  b: 272.9° e: 20.5°  1.03° apart
  minsep at 02Jul2015 21:26 PDT  b: 275.8° e: 16.6°  0.96° apart
  end at 02Jul2015 22:46 PDT  b: 287.6° e: 1.1°  1.10° apart
jupiter (full) and venus (crescent)
  start at 03Jul2015 21:06 PDT  b: 273.1° e: 19.9°  1.41° apart
  minsep at 03Jul2015 21:06 PDT  b: 273.1° e: 19.9°  1.41° apart
  end at 03Jul2015 22:46 PDT  b: 287.9° e: 0.6°  1.50° apart
    

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