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
30May2016 03:41:24 PDT	moon	108.2	15.4	370	0.40	77.5	-20.2
30May2016 03:41:24 PDT	mars	227.2	14.5	75255	1.00	169.5	-20.2
30May2016 03:41:24 PDT	saturn	215.0	23.3	1349682	1.00	175.8	-20.2
    

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


% sl_smrs 37.8 -122.4
30May2016:
Sunrise:  05:50 PDT (61.1°)
Sunset:   20:25 PDT (299.0°)
Moonrise: 02:16 PDT (95.2°)
Moonset:  14:21 PDT (267.7°)
    

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