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
    

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


% sl_smrs 37.8 -122.4
21Nov2017:
Sunrise:  06:57 PST (115.0°)
Sunset:   16:54 PST (244.8°)
Moonrise: 09:34 PST (115.7°)
Moonset:  19:41 PST (244.3°)
    

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