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
16Aug2018 13:32:46 PDT	sun	191.1	65.4	151478	1.00	0.0	65.4
16Aug2018 13:32:46 PDT	moon	112.8	12.9	383	0.35	73.4	65.4
16Aug2018 13:32:46 PDT	mercury	217.9	61.5	102803	0.10	12.5	65.4
16Aug2018 13:32:46 PDT	venus	132.6	34.6	103486	0.49	45.9	65.4
16Aug2018 13:32:46 PDT	jupiter	113.2	3.9	814496	0.99	81.5	65.4
    

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


% sl_smrs 37.8 -122.4
16Aug2018:
Sunrise:  06:26 PDT (71.9°)
Sunset:   20:01 PDT (287.8°)
Moonrise: 12:17 PDT (100.8°)
Moonset:  23:38 PDT (256.6°)
    

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