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
10Dec2016 10:25:12 PST	sun	155.2	25.0	147305	1.00	0.0	25.0
10Dec2016 10:25:12 PST	mercury	137.1	13.2	152480	0.64	20.8	25.0
10Dec2016 10:25:12 PST	jupiter	225.7	34.6	878020	0.99	60.7	25.0
10Dec2016 10:25:12 PST	saturn	154.9	26.3	1650876	1.00	1.3	25.0
    

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


% sl_smrs 37.8 -122.4
10Dec2016:
Sunrise:  07:15 PST (118.9°)
Sunset:   16:50 PST (241.0°)
Moonrise: 14:42 PST (78.2°)
Moonset:  03:07 PST (279.3°)
    

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