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
    

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


% sl_smrs 37.8 -122.4
23Aug2014:
Sunrise:  06:32 PDT (74.9°)
Sunset:   19:51 PDT (284.7°)
Moonrise: 04:54 PDT (72.6°)
Moonset:  18:39 PDT (285.2°)
    

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