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
26Apr2015 22:38:28 PDT	moon	239.3	47.7	398	0.62	103.4	-27.8
26Apr2015 22:38:28 PDT	venus	296.0	7.5	153642	0.69	41.4	-27.8
26Apr2015 22:38:28 PDT	jupiter	252.5	48.8	770120	0.99	96.5	-27.8
26Apr2015 22:38:28 PDT	saturn	120.3	7.1	1356569	1.00	153.2	-27.8
    

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


% sl_smrs 37.8 -122.4
26Apr2015:
Sunrise:  06:20 PDT (72.1°)
Sunset:   19:55 PDT (288.1°)
Moonrise: 13:22 PDT (74.8°)
Moonset:  02:21 PDT (286.9°)
    

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