Let's throw in an example of an observation that is evidence (for something) and is repeatable: a red shift. Anyone with a sufficiently large telescope with a spectrograph attached can point it at galaxies and measure how far the hydrogen-alpha line or a calcium line is from the wavelength a laboratory sample of the appropriate element gives. Henrietta Leavitt, in 1920, got the same numbers by measuring glass photographic plates as we get today with CCDs.
Pretty objective stuff.....
now, the subjective enters later, when Dr Arp disagrees with the other folks, and Dr Humphreys decides that light can "get tired"....
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