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
22Sep2014 15:18:39 PDT	sun	227.9	40.9	150142	1.00	0.0	40.9
22Sep2014 15:18:39 PDT	moon	244.4	32.8	400	0.02	15.5	40.9
22Sep2014 15:18:39 PDT	mercury	193.6	38.5	143478	0.57	26.4	40.9
22Sep2014 15:18:39 PDT	venus	239.1	39.9	253653	0.99	8.6	40.9
22Sep2014 15:18:39 PDT	mars	149.9	23.2	223318	0.88	66.3	40.9
22Sep2014 15:18:39 PDT	jupiter	276.0	20.5	889232	1.00	45.3	40.9
22Sep2014 15:18:39 PDT	saturn	163.6	34.9	1578416	1.00	49.9	40.9
    

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


% sl_smrs 37.8 -122.4
22Sep2014:
Sunrise:  06:58 PDT (89.2°)
Sunset:   19:06 PDT (270.6°)
Moonrise: 05:33 PDT (84.3°)
Moonset:  18:16 PDT (273.3°)
    

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