What is Calibration?
It is a fundamental attempt to determine what characteristic goes with which feature of the horoscope. It would require thousands of double-blind tests, as above. This is especially true as no physical mechanism has ever been suggested that would allow a theoretical calculation. There is no record of calibration ever having been done, or indeed, that astrologers ever thought it necessary. They certainly have never thought to redo it in modern times, or redo it to find out the effect of slow changes in the sky or the discovery of additional planets. Astrology, to the best of our knowledge, was developed by the ancient Zoroastrian Persian astrologer-priests as a revealed religion. It was carried to Greece and the Roman world, who developed their own variant. Who invented it is unknown, but it was passed down from priest to acolyte as inviolable knowledge from ancient sources.
Instrument calibration refers to exposing the instrument to a known quantity of the measured substance (real or simulated) and resetting the instrument if required. This verifies that the instrument is operating properly and adjusts for any sensor drift. For gas detection equipment this involves exposing the sensor to a known concentration of the target gas, usually from a calibration gas cylinder, and resetting the instrument to adjust for sensor drift.
