It’s triggered in wp_publish_post() that calls:
wp_transition_post_status( 'publish', $old_status, $post );
that fires up action calls, dynamically with:
do_action( "{$new_status}_{$post->post_type}", $post->ID, $post );
where "{$new_status}_{$post->post_type}" becomes "publish_post" in your case.
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