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
24May2015 22:27:44 PDT	moon	252.8	33.9	399	0.45	84.2	-20.5
24May2015 22:27:44 PDT	venus	290.9	13.8	121290	0.56	44.9	-20.5
24May2015 22:27:44 PDT	jupiter	268.0	31.0	836068	0.99	72.0	-20.5
24May2015 22:27:44 PDT	saturn	140.6	23.6	1341911	1.00	176.8	-20.5
    

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


% sl_smrs 37.8 -122.4
24May2015:
Sunrise:  05:54 PDT (62.7°)
Sunset:   20:20 PDT (297.5°)
Moonrise: 12:07 PDT (77.0°)
Moonset:  00:55 PDT (284.9°)
    

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