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
19Jul2019 18:07:07 PDT	sun	277.0	25.8	152022	1.00	0.0	25.8
19Jul2019 18:07:07 PDT	mercury	271.4	24.0	86457	0.01	5.4	25.8
19Jul2019 18:07:07 PDT	venus	282.7	21.1	256891	0.99	7.0	25.8
19Jul2019 18:07:07 PDT	mars	265.6	36.5	392465	0.99	14.5	25.8
19Jul2019 18:07:07 PDT	jupiter	124.5	6.3	671107	1.00	138.2	25.8
    

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


% sl_smrs 37.8 -122.4
19Jul2019:
Sunrise:  06:03 PDT (62.6°)
Sunset:   20:29 PDT (297.3°)
Moonrise: 22:32 PDT (107.4°)
Moonset:  08:32 PDT (249.9°)
    

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