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
03Apr2026 16:04:02 PDT	sun	241.3	39.5	149589	1.00	0.0	39.5
03Apr2026 16:04:02 PDT	mercury	250.4	12.9	132384	0.50	27.8	39.5
03Apr2026 16:04:02 PDT	venus	225.3	58.0	233086	0.93	21.1	39.5
03Apr2026 16:04:02 PDT	mars	248.1	21.6	342684	0.99	18.8	39.5
03Apr2026 16:04:02 PDT	jupiter	93.6	43.8	765546	0.99	91.8	39.5
03Apr2026 16:04:02 PDT	saturn	242.8	31.0	1568872	1.00	8.6	39.5
    

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


% sl_smrs 37.8 -122.4
03Apr2026:
Sunrise:  06:52 PDT (82.5°)
Sunset:   19:34 PDT (277.7°)
Moonrise: 21:39 PDT (113.9°)
Moonset:  07:21 PDT (249.9°)
    

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