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
03Jul2020 04:24:53 PDT	venus	73.5	6.9	60299	0.21	35.7	-14.5
03Jul2020 04:24:53 PDT	mars	134.1	39.9	120222	0.85	98.8	-14.5
03Jul2020 04:24:53 PDT	jupiter	215.2	22.0	622608	1.00	168.3	-14.5
03Jul2020 04:24:53 PDT	saturn	209.8	26.0	1353656	1.00	161.9	-14.5
    

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


% sl_smrs 37.8 -122.4
03Jul2020:
Sunrise:  05:53 PDT (59.8°)
Sunset:   20:35 PDT (300.1°)
Moonrise: 19:33 PDT (120.3°)
Moonset:  04:23 PDT (241.2°)
    

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