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
25May2015 08:34:13 PDT	sun	85.4	29.7	151521	1.00	0.0	29.7
25May2015 08:34:13 PDT	mercury	80.4	23.7	84693	0.02	7.5	29.7
25May2015 08:34:13 PDT	mars	81.0	26.0	378860	1.00	5.4	29.7
    

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


% sl_smrs 37.8 -122.4
25May2015:
Sunrise:  05:53 PDT (62.4°)
Sunset:   20:20 PDT (297.6°)
Moonrise: 13:02 PDT (81.4°)
Moonset:  01:28 PDT (280.7°)
    

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