Well, two half-steps equals one full step.
If you're having trouble visualizing what a half-step is, think of adjacent keys on the piano (and use the BACK of the keyboard).
From C down to B natural is a half-step.
From B natural down to Bb is a half-step.
Since a Bb horn is pitched one full step lower than concert pitch, the music written for it must be pitched one full step in the other direction (higher) to compensate.
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