New measurements of the Polar Star have revealed that the distance of the star from Earth is 323 light years, instead of 434 light years which was the last measurement known. 
Astronomy is the only science where measurements can change so drastically without anyone saying anything. What would your professor tell you if you had made a… “small” mistake of 100 light years in a distance measurement? Hahahaha!!! (Gr. Χαχαχαχαχα!!) And let’s not forget the infamous “discovery” that the visible matter which all astronomers thought was the total mass of the Universe, is only 5% of the total mass of the Universe (call me “Dark Energy” and “Dark Matter”). Small mistake. Just a 95% difference isn’t that important anyway! AHAHAHAHA!!!! And they accuse astrologists for inaccuracies…
I just hope the next measurement of the distance of Polar Star is not 212 light years… But even if it is, who will dare question the modern priests of stupidity?
PS. Shestov has talked nice about astrologists, revealing the nudity of astronomers. There are relevant posts… Actually astrology is not equal (as the title implies) but much more noble than astronomy in many aspects.
When you are talking about such large measurements, precision is sometimes difficult. But scientists never say that they are always right. That’s why they are able to make corrections- they are very willing to recheck their data. They depend on data, not beliefs that cannot be proven.
By the way, light years are very difficult to measure, so it’s not a surprise that they had to recheck that calculation.
I understand what you say, but you must also see that the correction I mentioned was mentioned because it was great not as an absolute number but as a percentage. And yes, surely I am a little bit hyperbolic sometimes, but this is only to emphasize what I want to say. Thanks for the comment!