Michael’s Miscellany: Tube Currents

One of the most important factors to amateur astronomers is seeing, which is defined as the steadiness of the atmosphere at your observing site. You can tell how good (or bad) the seeing is by viewing a reasonably bright (2nd magnitude) star near the zenith. If it’s twinkling wildly, the seeing is bad. But if theContinue reading “Michael’s Miscellany: Tube Currents”
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