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
25Jun2016 12:42:42 PDT	sun	154.1	74.2	152070	1.00	0.0	74.2
25Jun2016 12:42:42 PDT	mercury	203.2	73.9	181614	0.85	13.1	74.2
25Jun2016 12:42:42 PDT	venus	137.6	72.1	258081	1.00	5.2	74.2
25Jun2016 12:42:42 PDT	jupiter	90.8	11.6	848910	0.99	71.8	74.2
    

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


% sl_smrs 37.8 -122.4
25Jun2016:
Sunrise:  05:50 PDT (59.3°)
Sunset:   20:35 PDT (300.8°)
Moonrise: none
Moonset:  11:08 PDT (260.0°)
    

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