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
02Apr2026 09:20:12 PDT	sun	106.5	28.0	149534	1.00	0.0	28.0
02Apr2026 09:20:12 PDT	mercury	138.2	35.3	129614	0.48	27.8	28.0
02Apr2026 09:20:12 PDT	venus	87.3	17.0	233797	0.94	20.8	28.0
02Apr2026 09:20:12 PDT	mars	127.1	33.8	342986	0.99	18.5	28.0
02Apr2026 09:20:12 PDT	saturn	115.0	29.0	1569312	1.00	7.5	28.0
    

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


% sl_smrs 37.8 -122.4
02Apr2026:
Sunrise:  06:54 PDT (83.1°)
Sunset:   19:33 PDT (277.2°)
Moonrise: 20:36 PDT (107.2°)
Moonset:  06:56 PDT (256.8°)
    

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