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
20Jul2018 13:36:07 PDT	sun	195.6	72.2	152010	1.00	0.0	72.2
20Jul2018 13:36:07 PDT	mercury	142.2	59.2	107653	0.28	24.3	72.2
20Jul2018 13:36:07 PDT	venus	120.8	44.2	135696	0.62	43.8	72.2
    

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


% sl_smrs 37.8 -122.4
20Jul2018:
Sunrise:  06:04 PDT (62.9°)
Sunset:   20:28 PDT (297.0°)
Moonrise: 14:28 PDT (102.9°)
Moonset:  01:05 PDT (260.0°)
    

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