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
23Apr2026 19:11:06 PDT	sun	280.7	7.3	150438	1.00	0.0	7.3
23Apr2026 19:11:06 PDT	moon	165.7	73.6	369	0.50	89.8	7.3
23Apr2026 19:11:06 PDT	venus	272.4	32.0	220264	0.90	25.9	7.3
23Apr2026 19:11:06 PDT	jupiter	219.9	71.2	813495	0.99	74.0	7.3
    

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


% sl_smrs 37.8 -122.4
23Apr2026:
Sunrise:  06:24 PDT (73.3°)
Sunset:   19:53 PDT (287.0°)
Moonrise: 11:55 PDT (60.1°)
Moonset:  02:12 PDT (301.8°)
    

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


% sl_data -start 23Apr2026 -duration 7d -interval 5m -planets -refraction 37.8 -122.4 | sl_conjunctions
mars (full) and mercury (gibbous)
  start at 23Apr2026 05:45 PDT  b: 86.9° e: 1.5°  2.51° apart
  minsep at 23Apr2026 05:45 PDT  b: 86.9° e: 1.5°  2.51° apart
  end at 23Apr2026 06:00 PDT  b: 89.2° e: 4.2°  2.59° apart
saturn (full) and mars (full)
  start at 23Apr2026 05:35 PDT  b: 87.3° e: 0.9°  2.70° apart
  minsep at 23Apr2026 05:55 PDT  b: 90.4° e: 4.5°  2.59° apart
  end at 23Apr2026 06:00 PDT  b: 91.2° e: 5.5°  2.69° apart
    

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