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
20Jun2018 00:57:12 PDT	moon	271.4	5.0	377	0.49	88.0	-28.7
20Jun2018 00:57:12 PDT	mars	135.1	15.5	74492	0.94	139.8	-28.7
20Jun2018 00:57:12 PDT	jupiter	226.4	23.3	693307	1.00	135.0	-28.7
20Jun2018 00:57:12 PDT	saturn	167.9	28.8	1355088	1.00	172.6	-28.7
    

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


% sl_smrs 37.8 -122.4
20Jun2018:
Sunrise:  05:48 PDT (59.1°)
Sunset:   20:34 PDT (300.8°)
Moonrise: 13:31 PDT (87.3°)
Moonset:  01:27 PDT (275.7°)
    

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