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 37.8 -122.4 | sl_find 'elev>0'
# datetime		object	bearing	elev	dist	full	sunsep	sunelev
25Jan2020 12:00:20 PST	sun	173.9	33.0	147275	1.00	0.0	33.0
25Jan2020 12:00:20 PST	moon	161.1	30.1	395	0.01	11.3	33.0
25Jan2020 12:00:20 PST	mercury	161.7	32.2	194778	0.94	10.3	33.0
25Jan2020 12:00:20 PST	venus	127.9	29.2	168932	0.75	39.3	33.0
25Jan2020 12:00:20 PST	mars	225.4	14.5	298796	0.94	50.1	33.0
25Jan2020 12:00:20 PST	jupiter	199.5	26.8	914383	1.00	23.0	33.0
25Jan2020 12:00:20 PST	saturn	186.4	30.7	1645686	1.00	10.8	33.0
    

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


% sl_smrs 37.8 -122.4
25Jan2020:
Sunrise:  07:20 PST (113.7°)
Sunset:   17:25 PST (246.5°)
Moonrise: 08:06 PST (115.2°)
Moonset:  18:20 PST (246.4°)
    

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