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
19Mar2026 10:25:52 PDT	sun	123.7	35.1	148950	1.00	0.0	35.1
19Mar2026 10:25:52 PDT	moon	112.7	33.6	367	0.01	9.2	35.1
19Mar2026 10:25:52 PDT	mercury	149.0	40.0	101234	0.20	20.5	35.1
19Mar2026 10:25:52 PDT	venus	105.3	27.6	240767	0.96	17.4	35.1
19Mar2026 10:25:52 PDT	mars	143.0	37.3	346211	0.99	15.7	35.1
19Mar2026 10:25:52 PDT	saturn	119.1	31.5	1570161	1.00	5.3	35.1
    

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


% sl_smrs 37.8 -122.4
19Mar2026:
Sunrise:  07:15 PDT (90.0°)
Sunset:   19:20 PDT (270.3°)
Moonrise: 07:26 PDT (84.3°)
Moonset:  20:29 PDT (280.2°)
    

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