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
    

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


% sl_smrs 37.8 -122.4
20Jan2021:
Sunrise:  07:22 PST (115.0°)
Sunset:   17:20 PST (245.2°)
Moonrise: 11:42 PST (80.0°)
Moonset:  00:04 PST (277.0°)
    

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