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
31Oct2014 12:29:44 PDT	sun	172.8	37.6	148508	1.00	0.0	37.6
31Oct2014 12:29:44 PDT	mercury	195.6	45.2	144544	0.54	18.6	37.6
31Oct2014 12:29:44 PDT	venus	170.5	37.7	256532	1.00	1.9	37.6
31Oct2014 12:29:44 PDT	mars	125.0	3.0	252282	0.90	55.7	37.6
31Oct2014 12:29:44 PDT	jupiter	268.6	27.3	810635	0.99	77.9	37.6
31Oct2014 12:29:44 PDT	saturn	155.2	31.6	1629899	1.00	15.7	37.6
    

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


% sl_smrs 37.8 -122.4
31Oct2014:
Sunrise:  07:35 PDT (107.6°)
Sunset:   18:11 PDT (252.3°)
Moonrise: 14:23 PDT (104.0°)
Moonset:  00:35 PDT (253.4°)
    

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