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
24Apr2014 14:23:56 PDT	sun	219.5	60.0	150476	1.00	0.0	60.0
24Apr2014 14:23:56 PDT	moon	255.6	9.6	370	0.22	57.1	60.0
24Apr2014 14:23:56 PDT	mercury	220.4	58.5	199124	1.00	1.5	60.0
24Apr2014 14:23:56 PDT	venus	246.6	20.6	139943	0.64	43.8	60.0
24Apr2014 14:23:56 PDT	jupiter	91.8	41.9	822906	0.99	69.5	60.0

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

% sl_smrs 37.8 -122.4
24Apr2014:
Sunrise:  06:23 PDT (73.0°)
Sunset:   19:53 PDT (287.3°)
Moonrise: 03:32 PDT (98.5°)
Moonset:  15:20 PDT (264.2°)

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