Observer-local sky almanac for any lat/lon and time (default now). Returns the Sun's next rise/set + current altitude/azimuth; the Moon's rise/set, current alt/az, phase angle, phase name (New → Full → Waning Crescent), illuminated fraction, and next moon quarter; and for all seven non-Earth planets (Mercury→Neptune): altitude, azimuth, RA/dec, distance (AU), apparent magnitude, and whether each is currently above the horizon. Computed from first principles (astronomy-engine, sub-arcminute) — no external service, no key. Stargazing, astrophotography planning, 'what's up right now', is-it-dark-yet. `at` accepts any ISO timestamp.

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