[crimony]

I'm regularly reminded of the "Alan's editorializing" commentary in the "units.txt" file, which contains gems such as:

[in candela := cd]: "I think the candela is a scam, and I am completely opposed to it. Some good-for-nothing lighting "engineers" or psychologists probably got this perceptually-rigged abomination into the whole otherwise scientific endeavor...

...What an unbelievably useless and stupid unit."

[and in Hertz := Hz]: "Here is YET ANOTHER place where the SI made a really stupid definition...

... Either way, if I ever develop a time machine, I'm going to go back and knock both groups' heads together. At a frequency of about 1 Hz. Or better yet, strap them to a wheel and tell them I'm going to spin one group at a frequency of 1 Hz, and the other at 1 radian/s and let them try to figure out which one of those stupid inconsistent definitions means what. Hint: It'll depend on which time period I do it in, I guess, thanks to their useless inconsistent definition changes."

[lioeters]

Not sure I understand the second quibble. 2π radians per second = 1 hertz seem simple enough?

[jml7c5]

I believe his complaint is that SI defined 1 Hz as 1/s, not as 2π/s. So 2π Hz in the new definition is 1 Hz in the older.

It does make the Hz unit a bit redundant (saying "hertz" is no faster than "per second", and tends to obscure rather than elucidate). Though I do believe it ultimately has saved confusion as it means the 2π multiplier must be explicit,, which prevents accidental confusion between cycles per second and rate of rotation.