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
30Apr2016 23:10:42 PDT	mars	128.3	10.5	86816	0.98	153.5	-30.4
30Apr2016 23:10:42 PDT	jupiter	222.9	52.6	723065	0.99	122.1	-30.4
30Apr2016 23:10:42 PDT	saturn	122.1	5.9	1373115	1.00	146.0	-30.4
    

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


% sl_smrs 37.8 -122.4
30Apr2016:
Sunrise:  06:15 PDT (70.3°)
Sunset:   19:59 PDT (289.9°)
Moonrise: 02:20 PDT (107.8°)
Moonset:  13:17 PDT (254.0°)
    

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