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
23May2013 16:46:00 PDT	sun	266.3	39.9	151483	1.00	0.0	39.9
23May2013 16:46:00 PDT	mercury	260.7	53.5	178964	0.83	14.1	39.9
23May2013 16:46:00 PDT	venus	258.2	53.6	247079	0.97	14.7	39.9
23May2013 16:46:00 PDT	mars	269.9	32.1	368614	1.00	8.3	39.9
23May2013 16:46:00 PDT	jupiter	252.8	57.4	905817	1.00	19.5	39.9

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

% sl_smrs 37.8 -122.4
23May2013:
Sunrise:  05:54 PDT (62.8°)
Sunset:   20:19 PDT (297.3°)
Moonrise: 18:59 PDT (111.9°)
Moonset:  04:40 PDT (250.5°)

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
venus (full) and mercury (gibbous)
  start at 23May2013 20:52 PDT  b: 295.7° e: 6.2°  1.42° apart
  minsep at 23May2013 21:02 PDT  b: 297.2° e: 4.5°  1.41° apart
  end at 23May2013 21:22 PDT  b: 300.1° e: 1.1°  1.43° apart
venus (full) and mercury (gibbous)
  start at 24May2013 20:52 PDT  b: 295.4° e: 6.9°  1.35° apart
  minsep at 24May2013 21:02 PDT  b: 296.9° e: 5.2°  1.34° apart
  end at 24May2013 21:22 PDT  b: 299.9° e: 1.6°  1.42° apart
antisun and moon (full) (partial lunar eclipse)
  start at 24May2013 20:22 PDT  b: 297.5° e: 1.4°  1.04° apart
  minsep at 24May2013 20:42 PDT  b: 300.6° e: 4.7°  1.02° apart
  end at 24May2013 21:42 PDT  b: 310.9° e: 14.1°  1.26° apart
venus (full) and mercury (gibbous)
  start at 25May2013 20:52 PDT  b: 295.2° e: 7.5°  1.61° apart
  minsep at 25May2013 21:12 PDT  b: 298.0° e: 4.0°  1.56° apart
  end at 25May2013 21:22 PDT  b: 299.5° e: 2.2°  1.66° apart

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