Final answer:
The language Forth was developed for use in telescopes and is now used by courier services due to its simplicity and efficiency.
Step-by-step explanation:
The language developed for use in telescopes that is now used by courier services is Forth. Forth is a high-level programming language that was originally designed for control of hardware and real-time operations, such as those used in a telescope. Its design is simple and efficient, making it suitable for tasks like guiding a telescope or tracking packages. This makes it a popular choice for many industries, including courier services.
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