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
14Aug2020 18:52:45 PDT	sun	278.0	12.6	151515	1.00	0.0	12.6
14Aug2020 18:52:45 PDT	mercury	281.2	12.5	200011	0.99	3.2	12.6
14Aug2020 18:52:45 PDT	jupiter	125.8	7.1	639552	1.00	146.0	12.6
14Aug2020 18:52:45 PDT	saturn	119.0	2.2	1360192	1.00	154.4	12.6
    

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


% sl_smrs 37.8 -122.4
14Aug2020:
Sunrise:  06:25 PDT (71.4°)
Sunset:   20:02 PDT (288.3°)
Moonrise: 01:48 PDT (60.9°)
Moonset:  16:53 PDT (300.3°)
    

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