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use Astro::Observation;
my $obs = Astro::Observation->new( "simple", ... );
my $obc = Astro::Observation->new( "complex", ... );

use Astro::Observation::Simple;
use Astro::Observation::Complex;
my $obs = Astro::Observation::Simple->new( ... );
my $obc = Astro::Observation::Complex->new( ... );