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Thoughts while waiting to walk from Manchester to Rome in 2022

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measurement

Fathom

March 19, 2020 by Simon Robinson Leave a Comment

19 Mar 2020 – noon GMT – 7°C Mostly Cloudy – Co. Dublin, Ireland

We are exercising to stay fit. Outstretched arms, fingertip to fingertip, conveniently called a fathom in English. An anatomical unit of measure like cubit nor passus. Not really six feet either but once measures were standardised, it became six feet, then the unit of depth via weighted plumb-line measurements and now, I’ve got to the bottom of it. The largest of the anatomically inspired units. From a time when social isolations were the norm. Today we might call it 1.8288 metres but that requires a standard for the metre that we can’t carry with us. A metre today is the fixed numerical value of the speed of light in vacuum c to be 299 792 458 when expressed in the unit m⋅s−1, where the second is defined in terms of the caesium frequency ΔνCs. Imagine meeting a German who knew the ‘faden’ to be 1.7 metres or a Swede who used the ‘gamn’ for 1.784 metres or buying a length of silk from a Dutch trader selling in ‘vadem’ units equivalent to 1.818 metres. Reminds me of the international response to the Covid pandemic. Each nation cutting its cloth to its own measure despite globalised funding for a World Health Organisation. We know the metre was proposed by the French who defined it as one ten-millionth of the shortest distance from the North Pole to the equator passing through Paris. Not every country uses SI units and of those that do, some spell it differently. Thank you to China and South Korea for leading the way on Covid transmission mitigation and suppression. Sorry that global cooperation remains immature.

[Read more…] about Fathom

Filed Under: ManRom2021 Tagged With: booklink, david flanagan, exercise, measurement, richard creagh, wild atlantic way

Kalends and Ides

March 15, 2020 by Simon Robinson Leave a Comment

Caveat emptor: the things that flow through my consciousness are not always pleasant, complete let alone right.

The Romans left quite a legacy. Is that because they took the time to chisel their notes in the stones they built with? Calendars were a great invention and the Roman version remains dominant in global diplomacy and business. And it’s fundamental in many administrative regions of the world. Taxes tend to be assessed on 365 day years despite domestic use of different systems such as lunations in Muslim and Mosaic households. The ‘ides’ notion probably lost appeal after Brutus backstabbed Julius Caesar in 44 BC. And besides, Shakespeare told the world to be wary of them.

Hard to avoid thinking about calendars in a leap year. And reflecting on calendars brings time into view. And view is the right word. We lived for a while in the coyote-barking foothills of the San Gabriel mountains. Our zip code was the unforgettable 91011 which I could never remember, near where the astronomer Edwin Hubble spent the late 1920’s. He developed a view of nebulae fleeing from his 100 inch telescope. We met many who worked in Nasa’s JPL and Caltech and all spoke with passion of their pursuits of galaxies, now that they knew what nebulae were.

[Read more…] about Kalends and Ides

Filed Under: ManRom2021 Tagged With: albert einstein, edwin hubble, fred hoyle, georges lemaïtre, julius caesar, maths, measurement, william rowan hamilton, yesterday

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