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
21Feb2018 07:34:31 PST	sun	109.3	7.3	147963	1.00	0.0	7.3
21Feb2018 07:34:31 PST	mercury	107.1	4.2	202711	0.99	3.8	7.3
21Feb2018 07:34:31 PST	venus	100.8	1.0	250787	0.98	10.5	7.3
21Feb2018 07:34:31 PST	mars	188.5	29.4	220384	0.90	77.1	7.3
21Feb2018 07:34:31 PST	jupiter	214.6	27.2	772487	0.99	100.1	7.3
21Feb2018 07:34:31 PST	saturn	164.7	28.3	1583204	1.00	56.3	7.3
    

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


% sl_smrs 37.8 -122.4
21Feb2018:
Sunrise:  06:52 PST (102.6°)
Sunset:   17:55 PST (257.6°)
Moonrise: 10:19 PST (76.6°)
Moonset:  23:59 PST (286.1°)
    

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