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
07Feb2016 07:09:49 PST	moon	117.9	8.6	371	0.01	12.7	-0.6
07Feb2016 07:09:49 PST	mercury	130.6	13.5	149625	0.63	25.5	-0.6
07Feb2016 07:09:49 PST	venus	134.8	15.5	207122	0.87	30.1	-0.6
07Feb2016 07:09:49 PST	mars	198.8	34.3	195084	0.90	90.0	-0.6
07Feb2016 07:09:49 PST	jupiter	260.6	19.2	684178	1.00	146.4	-0.6
07Feb2016 07:09:49 PST	saturn	167.8	30.4	1558440	1.00	63.7	-0.6
    

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


% sl_smrs 37.8 -122.4
07Feb2016:
Sunrise:  07:09 PST (109.0°)
Sunset:   17:39 PST (251.2°)
Moonrise: 06:16 PST (109.7°)
Moonset:  17:04 PST (251.9°)
    

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