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
02Aug2021 09:13:35 PDT	sun	93.3	33.7	151810	1.00	0.0	33.7
02Aug2021 09:13:35 PDT	moon	211.1	70.0	398	0.30	67.1	33.7
02Aug2021 09:13:35 PDT	mercury	90.9	33.1	201375	1.00	2.1	33.7
02Aug2021 09:13:35 PDT	venus	82.1	2.4	195373	0.82	33.0	33.7
02Aug2021 09:13:35 PDT	mars	85.4	13.1	383281	0.99	21.8	33.7
    

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


% sl_smrs 37.8 -122.4
02Aug2021:
Sunrise:  06:15 PDT (66.9°)
Sunset:   20:16 PDT (292.9°)
Moonrise: 01:14 PDT (65.4°)
Moonset:  15:53 PDT (297.3°)
    

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