Astronomy is a skill, described in Basic Set, p. 179. It is referenced in GURPS Banestorm, p. 186, on astronomy in Yrth; in GURPS Low-Tech, p. 10, on the Observational specialty and use of Mathematics at low TLs; and in GURPS Low-Tech Companion 1: Philosophers and Kings, p. 20, on creating calendars, and p. 22, on placing standing stones for astronomical observation, and using orreries and telescopes.

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