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
20Feb2017 09:50:38 PST	sun	135.6	29.8	147942	1.00	0.0	29.8
20Feb2017 09:50:38 PST	moon	215.2	25.0	399	0.32	69.4	29.8
20Feb2017 09:50:38 PST	mercury	148.7	29.7	204472	0.95	11.4	29.8
20Feb2017 09:50:38 PST	venus	94.3	19.8	60543	0.24	38.6	29.8
20Feb2017 09:50:38 PST	mars	90.8	12.0	296518	0.94	45.1	29.8
20Feb2017 09:50:38 PST	saturn	210.7	23.7	1557995	1.00	66.2	29.8
    

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


% sl_smrs 37.8 -122.4
20Feb2017:
Sunrise:  06:53 PST (103.0°)
Sunset:   17:54 PST (257.2°)
Moonrise: 02:23 PST (113.1°)
Moonset:  12:43 PST (246.3°)
    

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