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
22May2018 18:32:19 PDT	sun	281.7	18.9	151453	1.00	0.0	18.9
22May2018 18:32:19 PDT	moon	135.9	53.2	371	0.60	102.1	18.9
22May2018 18:32:19 PDT	mercury	286.2	3.8	180463	0.82	15.8	18.9
22May2018 18:32:19 PDT	venus	266.0	48.7	198578	0.83	32.3	18.9
    

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


% sl_smrs 37.8 -122.4
22May2018:
Sunrise:  05:55 PDT (63.1°)
Sunset:   20:18 PDT (297.0°)
Moonrise: 13:30 PDT (77.4°)
Moonset:  02:14 PDT (285.1°)
    

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