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
23May2024 14:59:41 PDT	sun	243.2	60.2	151486	1.00	0.0	60.2
23May2024 14:59:41 PDT	mercury	254.1	39.5	159199	0.66	21.8	60.2
23May2024 14:59:41 PDT	venus	245.3	57.2	258946	1.00	3.2	60.2
23May2024 14:59:41 PDT	mars	263.9	17.3	282765	0.93	45.5	60.2
23May2024 14:59:41 PDT	jupiter	245.5	56.6	901451	1.00	3.9	60.2
    

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


% sl_smrs 37.8 -122.4
23May2024:
Sunrise:  05:54 PDT (62.7°)
Sunset:   20:20 PDT (297.5°)
Moonrise: 21:05 PDT (124.2°)
Moonset:  05:37 PDT (238.4°)
    

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