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
20Sep2018 11:14:50 PDT	sun	139.6	45.5	150225	1.00	0.0	45.5
20Sep2018 11:14:50 PDT	mercury	138.0	46.6	207317	1.00	1.5	45.5
20Sep2018 11:14:50 PDT	venus	122.7	8.7	63801	0.26	39.5	45.5
    

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


% sl_smrs 37.8 -122.4
20Sep2018:
Sunrise:  06:56 PDT (88.2°)
Sunset:   19:09 PDT (271.6°)
Moonrise: 17:07 PDT (112.9°)
Moonset:  02:38 PDT (245.4°)
    

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