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
28Apr2015 12:51:10 PDT	sun	170.4	66.2	150617	1.00	0.0	66.2
28Apr2015 12:51:10 PDT	mercury	124.5	65.1	155477	0.63	18.5	66.2
28Apr2015 12:51:10 PDT	venus	93.6	48.6	151885	0.68	41.6	66.2
28Apr2015 12:51:10 PDT	mars	139.9	65.7	368060	0.99	12.3	66.2
28Apr2015 12:51:10 PDT	jupiter	67.5	0.2	773903	0.99	95.0	66.2
    

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


% sl_smrs 37.8 -122.4
28Apr2015:
Sunrise:  06:18 PDT (71.4°)
Sunset:   19:57 PDT (288.9°)
Moonrise: 15:11 PDT (83.4°)
Moonset:  03:28 PDT (278.8°)
    

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