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
07Dec2016 06:20:41 PST	jupiter	143.6	39.4	884626	0.99	58.0	-10.1
    

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


% sl_smrs 37.8 -122.4
07Dec2016:
Sunrise:  07:13 PST (118.6°)
Sunset:   16:50 PST (241.4°)
Moonrise: 12:50 PST (95.6°)
Moonset:  none
    

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