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
21Nov2009 13:59:47 PST	sun	212.3	25.2	147768	1.00	0.0	25.2
21Nov2009 13:59:47 PST	moon	147.9	24.3	402	0.23	57.9	25.2
21Nov2009 13:59:47 PST	mercury	201.8	25.7	210723	0.97	9.5	25.2
21Nov2009 13:59:47 PST	venus	225.5	22.6	247694	0.98	12.3	25.2
21Nov2009 13:59:47 PST	jupiter	125.9	16.3	761311	0.99	80.0	25.2
21Nov2009 13:59:47 PST	saturn	268.2	4.1	1486063	1.00	57.5	25.2

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

% sl_smrs 37.8 -122.4
21Nov2009:
Sunrise:  06:57 PST (115.0°)
Sunset:   16:54 PST (244.9°)
Moonrise: 11:06 PST (116.5°)
Moonset:  21:13 PST (245.3°)

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