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
25May2018 05:59:33 PDT	sun	63.4	0.4	151520	1.00	0.0	0.4
25May2018 05:59:33 PDT	mercury	74.7	7.6	185485	0.87	13.4	0.4
25May2018 05:59:33 PDT	mars	189.9	29.8	98246	0.90	120.8	0.4
25May2018 05:59:33 PDT	saturn	216.4	20.6	1377674	1.00	146.2	0.4
    

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


% sl_smrs 37.8 -122.4
25May2018:
Sunrise:  05:53 PDT (62.4°)
Sunset:   20:21 PDT (297.8°)
Moonrise: 16:40 PDT (95.5°)
Moonset:  03:55 PDT (267.5°)
    

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