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
16Dec2017 10:24:05 PST	sun	154.4	24.4	147227	1.00	0.0	24.4
16Dec2017 10:24:05 PST	moon	170.2	33.8	401	0.02	16.6	24.4
16Dec2017 10:24:05 PST	mercury	162.1	30.0	104468	0.06	8.9	24.4
16Dec2017 10:24:05 PST	venus	160.1	26.7	254117	1.00	5.6	24.4
16Dec2017 10:24:05 PST	mars	211.8	34.2	311869	0.94	50.3	24.4
16Dec2017 10:24:05 PST	jupiter	200.2	34.7	918907	1.00	40.8	24.4
16Dec2017 10:24:05 PST	saturn	149.5	23.3	1652690	1.00	4.6	24.4
    

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


% sl_smrs 37.8 -122.4
16Dec2017:
Sunrise:  07:19 PST (119.4°)
Sunset:   16:52 PST (240.6°)
Moonrise: 05:44 PST (111.4°)
Moonset:  16:11 PST (247.4°)
    

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