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
30Aug2015 21:44:45 PDT	moon	103.2	14.4	357	0.97	159.4	-23.2
30Aug2015 21:44:45 PDT	saturn	230.2	16.6	1510692	1.00	81.4	-23.2
    

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


% sl_smrs 37.8 -122.4
30Aug2015:
Sunrise:  06:38 PDT (78.0°)
Sunset:   19:42 PDT (281.8°)
Moonrise: 20:25 PDT (91.3°)
Moonset:  07:41 PDT (265.5°)
    

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