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
02Sep2014 14:20:28 PDT	sun	212.7	55.8	150923	1.00	0.0	55.8
02Sep2014 14:20:28 PDT	mercury	178.1	51.6	183686	0.81	20.7	55.8
02Sep2014 14:20:28 PDT	venus	236.6	53.8	247745	0.97	13.9	55.8
02Sep2014 14:20:28 PDT	mars	131.2	15.5	207072	0.87	72.5	55.8
02Sep2014 14:20:28 PDT	jupiter	257.2	45.0	917355	1.00	29.8	55.8
02Sep2014 14:20:28 PDT	saturn	131.2	21.2	1535926	1.00	67.8	55.8
    

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


% sl_smrs 37.8 -122.4
02Sep2014:
Sunrise:  06:41 PDT (79.5°)
Sunset:   19:37 PDT (280.3°)
Moonrise: 14:22 PDT (113.7°)
Moonset:  none
    

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