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 12:18:36 PST	sun	186.7	32.6	147861	1.00	0.0	32.6
18Nov2018 12:18:36 PST	mercury	168.1	27.2	114665	0.24	16.9	32.6
18Nov2018 12:18:36 PST	venus	223.3	30.6	50449	0.15	31.1	32.6
18Nov2018 12:18:36 PST	jupiter	179.7	32.2	949290	1.00	5.9	32.6
18Nov2018 12:18:36 PST	saturn	143.7	20.2	1615407	1.00	40.1	32.6
    

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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