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
21Mar2026 08:04:41 PDT	sun	97.1	9.7	149029	1.00	0.0	9.7
21Mar2026 08:04:41 PDT	mercury	117.7	20.2	104551	0.25	22.4	9.7
21Mar2026 08:04:41 PDT	venus	81.8	0.8	239902	0.95	17.6	9.7
21Mar2026 08:04:41 PDT	mars	112.3	15.9	345779	0.99	16.1	9.7
21Mar2026 08:04:41 PDT	saturn	95.3	6.4	1570476	1.00	3.8	9.7
    

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


% sl_smrs 37.8 -122.4
21Mar2026:
Sunrise:  07:12 PDT (89.0°)
Sunset:   19:22 PDT (271.3°)
Moonrise: 08:24 PDT (68.0°)
Moonset:  22:58 PDT (296.3°)
    

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