UTC: How Greenwich mean time became the world standard

http://news.nationalgeographic.com/news/2013/05/130526-astronomy-nautical-navigation-space-longitude-moon-science/

by AxisOfEval • 13 years ago

29 21 13 years ago

news.nationalgeographic.com

rimantas• 13 years ago

Interestingly, article fails to mention John Harrison [1], the inventor of marine chronometer. There was a rivalry between Maskelyne and him, one considering lunar positions to be the best method to solve longitude problem, and the other believing that the accurate timepiece is the answer. You may say that Harriosn won at the end, but it was kind of bitter victory. Article quotes praise from Cook, but on next voyages Cook also tested chronometers made according to Harrison's design and praised them as well. If you are into this stuff there is a book "Longitude" by Dava Sobel.

ColinWright3• 13 years ago

Indeed, Cook says "My trusty friend, the watch" in reference to using Harrison's clock (or at least, the first copy of it - K1) during his second voyage.

melling• 13 years ago

Harrison won the the "X-Prize" money in the end. He spent decades perfecting his watches. H4 was the version that one. I took some inspiration from his persistence when I named my mobile software company h4labs.

Luc• 13 years ago

"Longitude" is a great book as an introduction, but it doesn't let historical accuracy get in the way of a good story. It's biased against Maskelyne, and gives undue attention to crazy ideas (about how to determine longitude) that were ridiculed at the time.

Her other book, "Galileo's Daughter", is just like that. Drama and story above facts.

Jamiecon• 13 years ago

For those visiting London (or who live here), I highly recommend a visit to Greenwich. There are several museums, including one at the Royal Observatory, a planetarium, a brewery that sells its own creations at the naval college and a huge park for those rare moments of sun.

http://www1.rmg.co.uk/

TheAnimus• 13 years ago

I'd also say it works well without sun, last time I visited was a bitter winters morning!

They also have the fantastic amature astronomy photographic exhibition.

mortov2• 13 years ago

I also strongly recommend membership too. There is so much to see that a single visit will never be enough - time is complex and the astonishing story of measurement and ties to astronomy and navigation which were a coernerstone to allowing discovery and for our modern society to evolve are astonishing.

The time and navigation section at the Smithsonian in Washington is also an interesting adjunct but the true gem (to me) is Greenwich.

Plus, membership also gets free access to the Cutty Sark and the Queens House making for an interesting day or two in London for anyone to enjoy.

smcl• 13 years ago

I tried to visit when I was last there but the DLR was out of action completely, and when I asked the staff how else I might get there from where I was they were completely out of ideas (one said "nah you're pretty much fucked...")

mortov2• 13 years ago

Welcome to UK customer service. You got one of the good ones - there are many much much worse.

There is a convenient river boat you could have taken from the center of London but don't expect anyone to tell you.

Screw you customer service is one of the worst things about living in the UK - especially if you're used to North America. I constantly dream of the days I can move back to my lovely house in Canada and put all this behind me.

jumblesale• 13 years ago

If you're ever in that situation again, try this: http://journeyplanner.tfl.gov.uk/user/XSLT_TRIP_REQUEST2?lan...

You can select what modes of transport you're interested in (so you could disable the tube if the DLR isn't running). It'll show you boats too which is cool and definitely the best way to get to Greenwich.

ColinWright3• 13 years ago

Quoting:

    ... moon's precise motion through the sky is anything
    but regular. Tugged as it is variously by the earth
    and sun and following an oblong orbit ...

An "oblong" orbit? Really?

petepete• 13 years ago

Oblong can be used to refer to any shape that's longer than it is wide. It's an uncommon use of the word these days, though.

kalleboo• 13 years ago

I always thought an "oblong" was a synonym for an oval. Today I learned something new.

ColinWright3• 13 years ago

Where I grew up, where I did my PhD, and where I now work, it has only ever been used as an informal work for "rectangle." I see Wikipedia say "sometimes used of any shape longer than it is wide." I would find it interesting to see a world map of that usage - it's completely foreign to me.

stephengillie2• 13 years ago

Sometimes, it seems like the world operates in 3 time zones: UTC, China time, and Pacific (SV/Redmond) time. These time zones are 8 hours apart.

alan_cx2• 13 years ago

Please correct me if I am wrong, but that sounds like a very US-centric view. I'm not sure the "world" operates like that at all.

stephengillie2• 13 years ago

How is it "US-centric" to include non-European time zones? Do you know how many countries use China time?

YokoZar• 13 years ago

I feel like we lucked out with the international dateline being exactly half way around the world from the observatory -- were it not for the random chance of geography, the dateline could have easily ended up in the middle of a populated landmass.

UTC: How Greenwich mean time became the world standard

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