>When I was a child my grandfather gave me an encyclopedia printed in 1888. My grandfather was born 1890. The book was given to him by his parents and has the family names inside. As I recall the book describes the 9 planets in detail. But you say Pluto was not discovered until 1930? Why 9 planets? The book describes the planet Vulcan, which was thought to be between Mercury and the Sun but “fell into the Sun”.
And today, astronomers are questioning whether Pluto should be labeled a planet: "If it were discovered nowadays, nobody would call it a planet". It is far smaller than the other planets. And the fact that it has a moon doesn't count either: other cases of double asteroids are known.
>One week after graduating from engineering college all electronic and physics terms that were from the United States were changed to European terms. I was already “obsolete” and only 7 days after graduation! No more “cycles per second”. Now it is “Hertz per second”. "That Hertz”!
As Dragan says, the unit is simply "Hertz". The "... per second" part is implied.
Hilmar.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)
