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
23Aug2019 17:31:43 PDT	sun	263.5	26.7	151275	1.00	0.0	26.7
23Aug2019 17:31:43 PDT	mercury	274.3	21.5	184862	0.89	11.1	26.7
23Aug2019 17:31:43 PDT	venus	261.8	29.3	258309	1.00	3.0	26.7
23Aug2019 17:31:43 PDT	mars	261.2	29.2	400055	1.00	3.3	26.7
23Aug2019 17:31:43 PDT	jupiter	144.3	21.1	738384	0.99	104.2	26.7
23Aug2019 17:31:43 PDT	saturn	120.8	2.2	1394241	1.00	133.9	26.7
    

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


% sl_smrs 37.8 -122.4
23Aug2019:
Sunrise:  06:32 PDT (74.8°)
Sunset:   19:52 PDT (284.9°)
Moonrise: none
Moonset:  14:06 PDT (292.1°)
    

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