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
20May2018 06:38:25 PDT	sun	69.9	6.9	151383	1.00	0.0	6.9
20May2018 06:38:25 PDT	mercury	85.5	16.4	175007	0.78	17.9	6.9
20May2018 06:38:25 PDT	mars	196.8	28.4	103589	0.90	117.8	6.9
20May2018 06:38:25 PDT	saturn	220.2	18.4	1385030	1.00	141.2	6.9
    

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


% sl_smrs 37.8 -122.4
20May2018:
Sunrise:  05:56 PDT (63.6°)
Sunset:   20:17 PDT (296.6°)
Moonrise: 11:16 PDT (67.7°)
Moonset:  00:47 PDT (293.7°)
    

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