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
12Dec2017 15:59:13 PST	sun	232.6	7.7	147280	1.00	0.0	7.7
12Dec2017 15:59:13 PST	mercury	233.6	9.2	101411	0.00	1.7	7.7
12Dec2017 15:59:13 PST	venus	237.9	3.8	253511	0.99	6.5	7.7
12Dec2017 15:59:13 PST	saturn	226.9	13.4	1651696	1.00	8.0	7.7
    

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


% sl_smrs 37.8 -122.4
12Dec2017:
Sunrise:  07:16 PST (119.1°)
Sunset:   16:51 PST (240.9°)
Moonrise: 01:55 PST (92.7°)
Moonset:  13:56 PST (264.6°)
    

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