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
06Mar2015 13:37:09 PST	sun	206.5	43.2	148418	1.00	0.0	43.2
06Mar2015 13:37:09 PST	mercury	224.7	23.4	165857	0.72	24.9	43.2
06Mar2015 13:37:09 PST	venus	161.6	57.3	202538	0.85	31.2	43.2
06Mar2015 13:37:09 PST	mars	172.0	56.1	338178	0.98	25.4	43.2
    

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


% sl_smrs 37.8 -122.4
06Mar2015:
Sunrise:  06:35 PST (96.6°)
Sunset:   18:08 PST (263.7°)
Moonrise: 19:19 PST (91.6°)
Moonset:  06:55 PST (270.8°)
    

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