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
25Apr2024 06:48:17 PDT	sun	76.4	4.7	150513	1.00	0.0	4.7
25Apr2024 06:48:17 PDT	moon	239.6	2.0	395	0.98	161.9	4.7
25Apr2024 06:48:17 PDT	mercury	94.3	13.8	94962	0.16	19.8	4.7
25Apr2024 06:48:17 PDT	venus	86.2	9.1	252788	0.98	10.7	4.7
25Apr2024 06:48:17 PDT	mars	113.0	22.8	298786	0.94	39.7	4.7
25Apr2024 06:48:17 PDT	saturn	123.3	25.9	1549322	1.00	49.6	4.7
    

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


% sl_smrs 37.8 -122.4
25Apr2024:
Sunrise:  06:21 PDT (72.3°)
Sunset:   19:55 PDT (288.0°)
Moonrise: 22:09 PDT (121.4°)
Moonset:  07:02 PDT (241.6°)
    

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