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
16Dec2025 13:34:12 PST	sun	202.6	25.4	147229	1.00	0.0	25.4
16Dec2025 13:34:12 PST	moon	234.0	6.7	405	0.09	35.3	25.4
16Dec2025 13:34:12 PST	mercury	222.0	19.9	178554	0.82	18.7	25.4
16Dec2025 13:34:12 PST	venus	207.8	23.9	254503	1.00	5.0	25.4
16Dec2025 13:34:12 PST	mars	195.9	26.3	362095	1.00	6.1	25.4
16Dec2025 13:34:12 PST	saturn	105.8	13.3	1418421	1.00	90.2	25.4
    

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


% sl_smrs 37.8 -122.4
16Dec2025:
Sunrise:  07:19 PST (119.4°)
Sunset:   16:52 PST (240.6°)
Moonrise: 04:27 PST (117.0°)
Moonset:  14:19 PST (240.9°)
    

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