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
13May2024 15:04:01 PDT	sun	241.6	58.0	151189	1.00	0.0	58.0
13May2024 15:04:01 PDT	moon	94.5	45.5	391	0.35	73.0	58.0
13May2024 15:04:01 PDT	mercury	252.4	33.1	133742	0.48	26.0	58.0
13May2024 15:04:01 PDT	venus	244.9	52.4	257500	0.99	5.9	58.0
13May2024 15:04:01 PDT	mars	260.4	16.8	288437	0.93	43.5	58.0
13May2024 15:04:01 PDT	jupiter	236.9	60.6	900838	1.00	3.6	58.0
    

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


% sl_smrs 37.8 -122.4
13May2024:
Sunrise:  06:01 PDT (65.5°)
Sunset:   20:11 PDT (294.6°)
Moonrise: 10:51 PDT (59.1°)
Moonset:  01:17 PDT (302.7°)
    

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