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
04Aug2021 14:44:39 PDT	sun	229.3	61.5	151766	1.00	0.0	61.5
04Aug2021 14:44:39 PDT	moon	278.4	31.8	397	0.13	43.2	61.5
04Aug2021 14:44:39 PDT	mercury	223.0	64.4	201972	0.99	4.1	61.5
04Aug2021 14:44:39 PDT	venus	160.1	57.1	193252	0.81	33.9	61.5
04Aug2021 14:44:39 PDT	mars	182.9	63.3	384293	0.99	21.1	61.5
    

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


% sl_smrs 37.8 -122.4
04Aug2021:
Sunrise:  06:16 PDT (67.5°)
Sunset:   20:14 PDT (292.2°)
Moonrise: 02:28 PDT (58.2°)
Moonset:  17:48 PDT (302.8°)
    

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