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
02Apr2026 16:33:11 PDT	sun	247.3	34.1	149547	1.00	0.0	34.1
02Apr2026 16:33:11 PDT	mercury	255.0	7.4	130265	0.49	27.7	34.1
02Apr2026 16:33:11 PDT	venus	234.9	53.1	233631	0.93	20.9	34.1
02Apr2026 16:33:11 PDT	mars	252.8	16.2	342915	0.99	18.6	34.1
02Apr2026 16:33:11 PDT	jupiter	98.0	48.8	763187	0.99	92.7	34.1
02Apr2026 16:33:11 PDT	saturn	247.9	26.4	1569214	1.00	7.8	34.1
    

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


% sl_smrs 37.8 -122.4
02Apr2026:
Sunrise:  06:54 PDT (83.1°)
Sunset:   19:33 PDT (277.2°)
Moonrise: 20:36 PDT (107.2°)
Moonset:  06:56 PDT (256.8°)
    

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