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
04Jun2020 17:19:09 PDT	sun	273.1	34.7	151783	1.00	0.0	34.7
04Jun2020 17:19:09 PDT	mercury	258.2	56.0	121916	0.36	23.6	34.7
04Jun2020 17:19:09 PDT	venus	274.3	32.9	43210	0.00	2.0	34.7
    

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


% sl_smrs 37.8 -122.4
04Jun2020:
Sunrise:  05:49 PDT (60.4°)
Sunset:   20:28 PDT (299.8°)
Moonrise: 19:34 PDT (114.8°)
Moonset:  05:02 PDT (248.5°)
    

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