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#metrology

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Joel Carnat ♑ 🤪

This is how I will render images from #Grafana, to insert #metrology graphs in Web pages, as of today. That will prevent me from doing duplicate jobs using RRDtool. Still a bit sad that this is implemented via a headless Chrome browser but hey, it’s 2025.

tumfatig.net/2025/rendering-st

www.tumfatig.netRendering static images from GrafanaWhen it comes to rendering graphical representation of all the metrics I gather, I generally use RRDtool . Yes, I’m that old ;-) But I also have a Grafana instance from which I render stuff that can’t be done using RRDgraph. But, so far, I couldn’t generate a static PNG file from a panel to insert in a static web page. But this was until I found the Grafana Image Rendered plug-in.
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ƧƿѦςɛ♏ѦਹѤʞ

@qurlyjoe @SaveStandard @rberger
FWIW about 1453 million million million million million million million million million, for which I don't think SI yet has a prefix.
Anyway, yes, the 'argument' over the two different measurements of the Hubble 'Constant' (LOL) has been running for years and definitely means that we don't know something. That's how science works. There's stuff we don't know and we try to find it out.
#science #astronomy #cosmology #metrology #Hubble

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Project Gutenberg

#OTD in 1889.

The General Conference on Weights and Measures (CGPM) defines the length of a metre.

The history of the metre starts with the Scientific Revolution that is considered to have begun with Nicolaus Copernicus's publication of De revolutionibus orbium coelestium in 1543. The Mètre des Archives & its copies were replaced from 1889 at the initiative of the International Geodetic Association by 30 platinum-iridium bars kept across the globe.

en.wikipedia.org/wiki/History_

Closeup of National Prototype Meter Bar No. 27, made in 1889 by the International Bureau of Weights and Measures (BIPM) and given to the United States, which served as the standard for defining all units of length in the US from 1893 to 1960. In 1960 the SI changed the standard of length to define the meter by the wavelength of light of a spectral line of krypton 86. This bar is now in the collection of the NIST Museum, Gaithersburg, Maryland, USA. After the Treaty of the Meter had been signed in 1875, the BIPM in Sevres, France made 30 prototype standard bars of 90% platinum–10% iridium alloy. One of the bars was selected as the International Meter. Small elliptical areas on the upper surface of the central rib at each end of the bars were highly polished, and three lines, nominally 0.5 mm apart, were ruled on these surfaces, the distance between the middle lines of each group at the temperature of freezing water defining the meter. After selecting the bar to be used as the International Prototype Meter, the other bars were calibrated relative to it and given to nations to serve as their national standards. The United States received National Prototype Meters No. 27 and No. 21 in 1890.
#science#metrology
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Sam at BLAG

@hildabast I saved your post last year to come back to, and thought of it again today when I read this in the Publi Fluor book. (Alt text contains a transciption of the paragraph from the book pictured.)

The use of Brussels isn't completely surprising, as the book is located in the city, but Lebanon felt a bit random.

For more on the book/project, take a look at the bl.ag online article here: bl.ag/peeling-back-the-layers-

Paragraph of text from a book that reads: "Figures for annual global production of self-adhesive vinyl film for decoration and lettering are very difficult to obtain, as for any petroleum product. But a realistic order of magnitude is two hundred million square meters, which would cover more than the entire area of the Brussels-Capital Region every year, and approximately the entire surface of Lebanon dating back to the beginning of vinyl production around a century ago."
#vinyl#lettering#brussels
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Flock of Cats 🐈 🐈 🐈 🌸

Random science thought:

My suspicion is that most non-science people don’t realize that just coming up with a definition “this is a kilogram” and then being able to make a measurement in a lab where you can say with confidence “this is a kilogram” has involved an an unimaginably huge amount of work and gazillions of dollars

(#Metrology toots coming in hot!!)

#science
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Chirayu :verified: :twit:

@sollat haha

On a serious note, #metrology is my favourite branch of science.

"The world & the universe is a big complicated place. & when we're actually able to ascribe numbers to it, it's like we're resting some sort of order out of the chaos that is our universe & that is the beginning of our understanding of the way things work."

Measurements after all are the foundation of #science and all the SI units are based on fundamental constants of nature.

youtube.com/watch?v=c_e1wITe_i

YouTubeThe kg is dead, long live the kgBy Veritasium
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Mark Dunk

What time is it on the Moon?

by Elizabeth Gibney

The coming decade will see a resurgence in lunar exploration — including dozens of missions and plans to establish permanent bases on the Moon. The endeavours pose myriad challenges. Among them is a subtle, but fundamental, question that metrologists worldwide are working to answer: what time is it on the Moon?

nature.com/articles/d41586-023

www.nature.comWhat time is it on the Moon?Satellite navigation systems for lunar settlements will require local atomic clocks. Scientists are working out what time they will keep.
#moon#metrology#time
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