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
31Jan2015 16:32:29 PST	sun	239.1	9.7	147392	1.00	0.0	9.7
31Jan2015 16:32:29 PST	moon	79.6	15.6	396	0.92	147.5	9.7
31Jan2015 16:32:29 PST	mercury	243.9	8.5	98067	0.02	4.9	9.7
31Jan2015 16:32:29 PST	venus	224.8	29.3	225954	0.92	23.7	9.7
31Jan2015 16:32:29 PST	mars	218.7	37.7	315864	0.96	33.5	9.7
    

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


% sl_smrs 37.8 -122.4
31Jan2015:
Sunrise:  07:15 PST (111.5°)
Sunset:   17:32 PST (248.7°)
Moonrise: 15:03 PST (67.0°)
Moonset:  04:39 PST (293.4°)
    

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