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
20May2013 09:12:27 PDT	sun	92.1	36.8	151390	1.00	0.0	36.8
20May2013 09:12:27 PDT	mercury	82.4	30.1	186786	0.90	10.5	36.8
20May2013 09:12:27 PDT	venus	80.9	26.8	248444	0.97	13.8	36.8
20May2013 09:12:27 PDT	mars	99.4	41.9	368394	1.00	7.6	36.8
20May2013 09:12:27 PDT	jupiter	76.0	20.0	902847	1.00	21.9	36.8

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

% sl_smrs 37.8 -122.4
20May2013:
Sunrise:  05:56 PDT (63.6°)
Sunset:   20:17 PDT (296.6°)
Moonrise: 15:35 PDT (95.9°)
Moonset:  02:48 PDT (267.2°)

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 21May2013 20:45 PDT  b: 295.2° e: 6.1°  2.41° apart
  minsep at 21May2013 20:45 PDT  b: 295.2° e: 6.1°  2.41° apart
  end at 21May2013 21:15 PDT  b: 299.7° e: 0.8°  2.46° apart
venus (full) and mercury (gibbous)
  start at 22May2013 20:45 PDT  b: 295.0° e: 6.8°  1.83° apart
  minsep at 22May2013 20:55 PDT  b: 296.5° e: 5.0°  1.74° apart
  end at 22May2013 21:15 PDT  b: 299.4° e: 1.5°  1.82° apart

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