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
16Jul2018 22:39:55 PDT	moon	271.5	8.2	369	0.23	56.7	-20.6
16Jul2018 22:39:55 PDT	mars	132.2	10.2	59722	0.99	166.4	-20.6
16Jul2018 22:39:55 PDT	jupiter	220.0	27.3	745121	0.99	108.8	-20.6
16Jul2018 22:39:55 PDT	saturn	162.1	27.5	1362290	1.00	159.8	-20.6
    

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


% sl_smrs 37.8 -122.4
16Jul2018:
Sunrise:  06:01 PDT (62.0°)
Sunset:   20:30 PDT (297.9°)
Moonrise: 10:12 PDT (78.6°)
Moonset:  23:26 PDT (278.1°)
    

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