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
01Jul2016 10:11:52 PDT	sun	97.5	48.6	152100	1.00	0.0	48.6
01Jul2016 10:11:52 PDT	moon	163.5	67.0	360	0.10	37.3	48.6
01Jul2016 10:11:52 PDT	mercury	101.7	54.7	193699	0.96	6.6	48.6
01Jul2016 10:11:52 PDT	venus	92.2	42.8	256962	0.99	6.9	48.6
    

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


% sl_smrs 37.8 -122.4
01Jul2016:
Sunrise:  05:52 PDT (59.6°)
Sunset:   20:35 PDT (300.3°)
Moonrise: 03:35 PDT (70.7°)
Moonset:  17:48 PDT (291.1°)
    

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