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
30Jan2015 16:45:16 PST	sun	241.1	7.3	147372	1.00	0.0	7.3
30Jan2015 16:45:16 PST	moon	88.0	27.8	391	0.86	136.3	7.3
30Jan2015 16:45:16 PST	mercury	244.7	8.0	98331	0.01	3.7	7.3
30Jan2015 16:45:16 PST	venus	227.6	27.0	226537	0.92	23.5	7.3
30Jan2015 16:45:16 PST	mars	221.6	35.9	315195	0.96	33.7	7.3
    

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


% sl_smrs 37.8 -122.4
30Jan2015:
Sunrise:  07:16 PST (111.9°)
Sunset:   17:30 PST (248.2°)
Moonrise: 14:11 PST (66.4°)
Moonset:  03:48 PST (293.3°)
    

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