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
03May2016 07:26:25 PDT	sun	80.2	13.5	150838	1.00	0.0	13.5
03May2016 07:26:25 PDT	moon	124.6	33.7	360	0.15	45.0	13.5
03May2016 07:26:25 PDT	mercury	71.9	9.2	89061	0.04	9.2	13.5
03May2016 07:26:25 PDT	venus	88.7	17.9	254596	0.99	9.2	13.5
03May2016 07:26:25 PDT	mars	241.2	1.0	85092	0.98	156.2	13.5
03May2016 07:26:25 PDT	saturn	236.4	7.4	1369945	1.00	148.4	13.5
    

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


% sl_smrs 37.8 -122.4
03May2016:
Sunrise:  06:11 PDT (69.0°)
Sunset:   20:02 PDT (291.1°)
Moonrise: 04:17 PDT (92.5°)
Moonset:  16:37 PDT (270.4°)
    

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