Sirius observatory. Mine is well over 20 years old, still going strong.
A permanent place for you gear, seriously refined polar alignment and tihe ability to be imaging or observing within minutes. The scope is protected from wind buffetting and stray lights. Multi-night imaging is also a doddle.
Sure the telescopes and cameras have changed over the years, but being able to be up and running, even on nights where the weather seemed doubtful, makes a dome soooo worthwhile.
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