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
21Oct2017 10:32:42 PDT	sun	138.4	31.1	148902	1.00	0.0	31.1
21Oct2017 10:32:42 PDT	moon	120.6	14.4	398	0.04	23.3	31.1
21Oct2017 10:32:42 PDT	mercury	133.1	23.9	212083	0.97	8.6	31.1
21Oct2017 10:32:42 PDT	venus	153.5	46.7	235790	0.94	19.5	31.1
21Oct2017 10:32:42 PDT	mars	165.5	52.6	368226	0.98	29.2	31.1
21Oct2017 10:32:42 PDT	jupiter	134.8	28.5	962657	1.00	4.1	31.1
    

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


% sl_smrs 37.8 -122.4
21Oct2017:
Sunrise:  07:25 PDT (103.3°)
Sunset:   18:23 PDT (256.5°)
Moonrise: 09:05 PDT (106.4°)
Moonset:  19:58 PDT (251.8°)
    

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