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
27Mar2015 12:11:06 PDT	sun	153.5	52.0	149278	1.00	0.0	52.0
27Mar2015 12:11:06 PDT	mercury	172.4	47.6	196607	0.92	12.9	52.0
27Mar2015 12:11:06 PDT	venus	102.5	41.6	184557	0.79	35.7	52.0
27Mar2015 12:11:06 PDT	mars	122.1	48.3	350996	0.99	20.3	52.0
    

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


% sl_smrs 37.8 -122.4
27Mar2015:
Sunrise:  07:03 PDT (86.1°)
Sunset:   19:27 PDT (274.1°)
Moonrise: 12:47 PDT (67.7°)
Moonset:  02:19 PDT (292.8°)
    

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