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
08Feb2016 15:12:32 PST	sun	225.3	24.1	147577	1.00	0.0	24.1
08Feb2016 15:12:32 PST	moon	224.3	28.5	364	0.00	4.5	24.1
08Feb2016 15:12:32 PST	mercury	240.3	3.1	152903	0.65	25.5	24.1
    

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


% sl_smrs 37.8 -122.4
08Feb2016:
Sunrise:  07:08 PST (108.6°)
Sunset:   17:40 PST (251.6°)
Moonrise: 07:01 PST (105.8°)
Moonset:  18:11 PST (256.3°)
    

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