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
16May2024 07:06:26 PDT	sun	74.6	11.8	151272	1.00	0.0	11.8
16May2024 07:06:26 PDT	mercury	97.7	24.3	140482	0.53	25.3	11.8
16May2024 07:06:26 PDT	venus	79.1	14.4	257965	1.00	5.2	11.8
16May2024 07:06:26 PDT	mars	116.0	34.7	286925	0.93	44.0	11.8
16May2024 07:06:26 PDT	jupiter	73.9	10.2	901292	1.00	1.7	11.8
16May2024 07:06:26 PDT	saturn	146.0	39.7	1504577	1.00	68.3	11.8
    

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


% sl_smrs 37.8 -122.4
16May2024:
Sunrise:  05:59 PDT (64.7°)
Sunset:   20:14 PDT (295.6°)
Moonrise: 13:56 PDT (77.7°)
Moonset:  02:46 PDT (285.6°)
    

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