Paidon, there can be little question regarding the discovery of hours, minute and seconds. The Egyptians are credited for discovering hours, the Babylonians are credited with minutes and seconds. But to suggest time is man-made because it was discovered by man is like saying "El Capitan" in Yosemite was man-made because John Muir discovered it. It is also obvious that the Egyptian model didn't work as well, nor has the metric system of keeping time for if they had they'd still be in use today.Paidion wrote:On earth, dividing the day into 24 hours, and the hour into 60 minutes, and the minute into 60 seconds, has absolutely NO BEARING on any astronomical events --- and it has no relationship to the YEAR (or the length of revolution around the sun). The length of an hour is entirely arbitrary. We could have had a metric hour --- 10 hours in a day; 10 minutes in an hour; 10 seconds in a minute; 10 deciseconds in a second, etc. It would have worked just as well. In that case, there would have been 10 time zones, with 36º in each zone, rather than 24 zones, each covering 15º. Any problem with that?
Progress!With the rotation of Venus being longer than its revolution, I guess the same side of the planet would be facing the sun most of the time. I don't know how "hours" would work on that planet. So I retract my statement about "any planet".
Are you planning on moving to Mars anytime soon? If not, time on Mars is irrelevant.However, there would seem to be no problem in dividing the planet Mars up into 24 time zones with 24 Martian hours in a Martian day. Mars rotation takes only 39 Terran minutes longer than a rotation of the earth. This would mean that each Martian hour would be 61.625 Terran minutes. But the Martian hour could still be defined as 60 Martian minutes, and each Martian minute as 60 Martian seconds. That wouldn't be a problem, would it?
Had the first person never inquired about the sun and the shadows it caused on earth there may never had been a science called astronomy. Actually the Babylonians did indeed base minutes and seconds on the astrological relationship between earth and sun.All of this is manmade, and has no relation to astronomical events.
Considering a day on Venus is irrelevant to life on earth I think the information regarding Venus would only be useful at a cocktail party or to astronomer.In the case of Venus, I have difficulty visualizing the rotation of a planet whose day is longer than it's year. It would seem that the same side would be facing the sun most of the time, just as the same side of the moon faces the earth. So I'm not sure that that "day" could be divided into hours.