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
06May2013 09:53:50 PDT	sun	103.0	43.0	150938	1.00	0.0	43.0
06May2013 09:53:50 PDT	moon	160.2	56.6	386	0.11	38.0	43.0
06May2013 09:53:50 PDT	mercury	110.7	45.7	197186	0.97	6.1	43.0
06May2013 09:53:50 PDT	venus	93.1	36.4	253158	0.98	10.1	43.0
06May2013 09:53:50 PDT	mars	108.0	45.3	366943	1.00	4.3	43.0
06May2013 09:53:50 PDT	jupiter	76.2	19.8	886965	1.00	32.4	43.0

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

% sl_smrs 37.8 -122.4
06May2013:
Sunrise:  06:08 PDT (68.0°)
Sunset:   20:05 PDT (292.2°)
Moonrise: 04:10 PDT (83.3°)
Moonset:  17:13 PDT (279.5°)

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