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
15Sep2025 18:23:38 PDT	sun	265.8	9.7	150413	1.00	0.0	9.7
15Sep2025 18:23:38 PDT	mercury	264.4	12.0	208099	1.00	2.7	9.7
15Sep2025 18:23:38 PDT	mars	235.0	23.4	346284	0.97	32.4	9.7
    

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


% sl_smrs 37.8 -122.4
15Sep2025:
Sunrise:  06:52 PDT (85.9°)
Sunset:   19:16 PDT (273.8°)
Moonrise: 00:11 PDT (53.1°)
Moonset:  16:02 PDT (305.7°)
    

And here are the close celestial encounters for the next week:


% sl_data -start 15Sep2025 -duration 7d -interval 5m -planets -refraction 37.8 -122.4 | sl_conjunctions
venus (gibbous) and moon (crescent)
  start at 19Sep2025 04:45 PDT  b: 73.9° e: 0.2°  0.78° apart
  minsep at 19Sep2025 04:55 PDT  b: 75.4° e: 2.0°  0.72° apart
  end at 19Sep2025 11:00 PDT  b: 163.3° e: 63.1°  2.96° apart
    

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