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
24Feb2018 08:07:34 PST	sun	114.0	14.2	148062	1.00	0.0	14.2
24Feb2018 08:07:34 PST	mercury	109.1	10.3	198068	0.98	6.2	14.2
24Feb2018 08:07:34 PST	venus	104.5	7.9	249990	0.98	11.2	14.2
24Feb2018 08:07:34 PST	mars	198.0	27.5	216020	0.89	78.3	14.2
24Feb2018 08:07:34 PST	jupiter	224.5	21.6	765274	0.99	103.0	14.2
24Feb2018 08:07:34 PST	saturn	176.2	29.7	1576816	1.00	59.1	14.2
    

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


% sl_smrs 37.8 -122.4
24Feb2018:
Sunrise:  06:48 PST (101.2°)
Sunset:   17:58 PST (259.0°)
Moonrise: 12:32 PST (65.3°)
Moonset:  02:10 PST (293.8°)
    

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