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
08Feb2023 14:55:01 PST	sun	221.5	26.5	147572	1.00	0.0	26.5
08Feb2023 14:55:01 PST	mercury	235.6	7.5	172079	0.77	23.2	26.5
08Feb2023 14:55:01 PST	venus	197.4	43.9	219423	0.90	26.1	26.5
08Feb2023 14:55:01 PST	mars	80.4	30.0	142012	0.91	112.3	26.5
08Feb2023 14:55:01 PST	jupiter	167.8	53.5	831990	0.99	47.6	26.5
08Feb2023 14:55:01 PST	saturn	215.1	31.1	1620947	1.00	7.2	26.5
    

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


% sl_smrs 37.8 -122.4
08Feb2023:
Sunrise:  07:07 PST (108.4°)
Sunset:   17:40 PST (251.7°)
Moonrise: 20:40 PST (85.4°)
Moonset:  08:51 PST (278.1°)
    

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