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 -refraction 37.8 -122.4 | sl_find 'elev>0'
# datetime		object	bearing	elev	dist	full	sunsep	sunelev
10Jun2023 03:31:00 PDT	moon	122.0	20.3	368	0.54	94.6	-20.6
10Jun2023 03:31:00 PDT	jupiter	74.5	0.7	843095	0.99	44.3	-20.6
10Jun2023 03:31:00 PDT	saturn	128.5	25.7	1431029	1.00	102.0	-20.6
    

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


% sl_smrs 37.8 -122.4
10Jun2023:
Sunrise:  05:48 PDT (59.7°)
Sunset:   20:31 PDT (300.4°)
Moonrise: 01:34 PDT (103.2°)
Moonset:  12:59 PDT (260.7°)
    

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