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
31Mar2026 16:02:52 PDT	sun	239.8	39.1	149460	1.00	0.0	39.1
31Mar2026 16:02:52 PDT	mercury	249.6	12.8	125893	0.45	27.6	39.1
31Mar2026 16:02:52 PDT	venus	224.3	56.7	234734	0.94	20.4	39.1
31Mar2026 16:02:52 PDT	mars	246.5	21.8	343389	0.99	18.2	39.1
31Mar2026 16:02:52 PDT	jupiter	91.6	41.4	758326	0.99	94.5	39.1
31Mar2026 16:02:52 PDT	saturn	240.2	32.9	1569809	1.00	6.1	39.1
    

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


% sl_smrs 37.8 -122.4
31Mar2026:
Sunrise:  06:57 PDT (84.0°)
Sunset:   19:31 PDT (276.2°)
Moonrise: 18:32 PDT (92.0°)
Moonset:  06:10 PDT (272.2°)
    

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