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
18Nov2018 18:51:50 PST	moon	139.9	41.6	388	0.81	128.9	-22.8
18Nov2018 18:51:50 PST	mars	185.2	39.8	137431	0.86	95.3	-22.8
18Nov2018 18:51:50 PST	saturn	234.6	6.4	1615842	1.00	39.9	-22.8
    

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


% sl_smrs 37.8 -122.4
18Nov2018:
Sunrise:  06:54 PST (114.1°)
Sunset:   16:56 PST (245.8°)
Moonrise: 14:48 PST (93.7°)
Moonset:  01:59 PST (263.4°)
    

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