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
15Dec2017 10:00:48 PST	sun	149.2	22.3	147240	1.00	0.0	22.3
15Dec2017 10:00:48 PST	moon	176.4	36.9	399	0.06	27.6	22.3
15Dec2017 10:00:48 PST	mercury	154.1	27.3	103025	0.04	6.7	22.3
15Dec2017 10:00:48 PST	venus	154.8	25.2	253962	1.00	5.9	22.3
15Dec2017 10:00:48 PST	mars	205.0	36.8	313107	0.94	49.9	22.3
15Dec2017 10:00:48 PST	jupiter	192.6	36.2	920530	1.00	39.9	22.3
15Dec2017 10:00:48 PST	saturn	143.6	20.4	1652476	1.00	5.5	22.3
    

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


% sl_smrs 37.8 -122.4
15Dec2017:
Sunrise:  07:18 PST (119.3°)
Sunset:   16:51 PST (240.6°)
Moonrise: 04:48 PST (107.7°)
Moonset:  15:34 PST (250.6°)
    

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