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
28Jul2016 07:41:44 PDT	sun	78.6	16.3	151898	1.00	0.0	16.3
28Jul2016 07:41:44 PDT	moon	151.9	64.2	364	0.31	68.1	16.3
28Jul2016 07:41:44 PDT	venus	72.2	3.5	248046	0.97	14.3	16.3
    

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


% sl_smrs 37.8 -122.4
28Jul2016:
Sunrise:  06:11 PDT (65.3°)
Sunset:   20:21 PDT (294.5°)
Moonrise: 01:33 PDT (72.3°)
Moonset:  15:37 PDT (289.8°)
    

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