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
24Jul2014 13:02:41 PDT	sun	169.8	71.7	151961	1.00	0.0	71.7
24Jul2014 13:02:41 PDT	moon	230.2	62.4	397	0.04	24.0	71.7
24Jul2014 13:02:41 PDT	mercury	219.9	70.9	169845	0.75	15.6	71.7
24Jul2014 13:02:41 PDT	venus	238.6	65.6	226484	0.91	24.3	71.7
24Jul2014 13:02:41 PDT	jupiter	169.3	72.1	939783	1.00	0.4	71.7
    

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


% sl_smrs 37.8 -122.4
24Jul2014:
Sunrise:  06:07 PDT (63.9°)
Sunset:   20:25 PDT (295.9°)
Moonrise: 04:19 PDT (66.3°)
Moonset:  18:45 PDT (293.0°)
    

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