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
05Dec2023 07:50:35 PST	sun	124.5	6.2	147426	1.00	0.0	6.2
05Dec2023 07:50:35 PST	moon	215.3	54.5	399	0.46	85.4	6.2
05Dec2023 07:50:35 PST	venus	154.0	38.8	150691	0.69	42.1	6.2
05Dec2023 07:50:35 PST	mars	128.0	9.9	373053	1.00	5.1	6.2
    

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


% sl_smrs 37.8 -122.4
05Dec2023:
Sunrise:  07:10 PST (118.1°)
Sunset:   16:50 PST (241.8°)
Moonrise: none
Moonset:  13:00 PST (278.0°)
    

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