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
03Jul2025 19:37:14 PDT	sun	291.6	9.5	152089	1.00	0.0	9.5
03Jul2025 19:37:14 PDT	moon	174.6	38.3	400	0.62	104.4	9.5
03Jul2025 19:37:14 PDT	mercury	272.2	27.8	124836	0.41	25.9	9.5
03Jul2025 19:37:14 PDT	mars	239.5	45.4	291119	0.93	57.2	9.5
03Jul2025 19:37:14 PDT	jupiter	296.2	4.5	920442	1.00	6.8	9.5
    

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


% sl_smrs 37.8 -122.4
03Jul2025:
Sunrise:  05:53 PDT (59.8°)
Sunset:   20:35 PDT (300.1°)
Moonrise: 14:24 PDT (105.2°)
Moonset:  00:55 PDT (258.6°)
    

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