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 -refraction 37.8 -122.4 | sl_find 'elev>0'
# datetime		object	bearing	elev	dist	full	sunsep	sunelev
19Apr2021 14:40:27 PDT	sun	224.0	56.6	150282	1.00	0.0	56.6
19Apr2021 14:40:27 PDT	moon	82.3	31.3	390	0.46	86.3	56.6
19Apr2021 14:40:27 PDT	mercury	222.3	57.1	198477	1.00	1.1	56.6
19Apr2021 14:40:27 PDT	venus	215.2	61.1	256229	0.99	6.4	56.6
19Apr2021 14:40:27 PDT	mars	101.8	56.4	288467	0.93	57.8	56.6
    

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


% sl_smrs 37.8 -122.4
19Apr2021:
Sunrise:  06:29 PDT (75.0°)
Sunset:   19:49 PDT (285.3°)
Moonrise: 11:41 PDT (58.2°)
Moonset:  02:08 PDT (302.5°)
    

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