{"product_id":"jetlagga-clocks-around-the-world-1971-physics-t-shirt","title":"Jetlagga – Clocks Around the World 1971 Physics T-Shirt","description":"\u003cp\u003eJetlagga flies with a caesium clock in her backpack. East or west, it comes home not quite agreeing with the ground.\u003c\/p\u003e\u003ch3\u003eThe Physics\u003c\/h3\u003e\u003cp\u003eIn October 1971 four caesium-beam atomic clocks were flown around the world on airliners, once eastward and once westward. Speed slows a clock; height speeds it up. Earth's spin means the eastbound plane moves faster than the ground and the westbound one slower, so the two trips differ.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eObserved: eastward −59 ± 10 ns, westward +273 ± 7 ns   (predicted −40 ± 23 ns and +275 ± 21 ns)\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003ens: nanoseconds, 10⁻⁹ s, clock gain (+) or loss (−) relative to the ground\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003eJ. C. Hafele and R. E. Keating flew the clocks in October 1971 and published in Science in 1972.\u003c\/p\u003e\u003ch3\u003eOn the shirt\u003c\/h3\u003e\u003cp\u003eFront: Jetlagga, the pixel-art character, with the title. Back: the observed-versus-predicted table, the speed-and-height explanation and the Science papers. Printed on a unisex tee.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"S \/ White","offer_id":50936574640231,"sku":"17871718091035688232","price":29.99,"currency_code":"USD","in_stock":true},{"title":"S \/ Black","offer_id":50936574672999,"sku":"26779065389030736920","price":29.99,"currency_code":"USD","in_stock":true},{"title":"M \/ White","offer_id":50936574705767,"sku":"26807489086238211316","price":29.99,"currency_code":"USD","in_stock":true},{"title":"M \/ Black","offer_id":50936574738535,"sku":"32547527863489312692","price":29.99,"currency_code":"USD","in_stock":true},{"title":"L \/ White","offer_id":50936574771303,"sku":"24431940817125789374","price":29.99,"currency_code":"USD","in_stock":true},{"title":"L \/ Black","offer_id":50936574804071,"sku":"67329154640894092101","price":29.99,"currency_code":"USD","in_stock":true},{"title":"XL \/ White","offer_id":50936574836839,"sku":"48241314673119398599","price":29.99,"currency_code":"USD","in_stock":true},{"title":"XL \/ Black","offer_id":50936574869607,"sku":"23663408053380015561","price":29.99,"currency_code":"USD","in_stock":true},{"title":"2XL \/ White","offer_id":50936574902375,"sku":"22284025420194505627","price":29.99,"currency_code":"USD","in_stock":true},{"title":"2XL \/ Black","offer_id":50936574935143,"sku":"71753780903805156099","price":29.99,"currency_code":"USD","in_stock":true},{"title":"3XL \/ White","offer_id":50936574967911,"sku":"16019509289234884901","price":29.99,"currency_code":"USD","in_stock":true},{"title":"3XL \/ Black","offer_id":50936575000679,"sku":"24433379662177931355","price":29.99,"currency_code":"USD","in_stock":true},{"title":"4XL \/ White","offer_id":50936575033447,"sku":"29514088767735311923","price":29.99,"currency_code":"USD","in_stock":true},{"title":"4XL \/ Black","offer_id":50936575066215,"sku":"20555638879409317685","price":29.99,"currency_code":"USD","in_stock":true},{"title":"5XL \/ White","offer_id":50936575098983,"sku":"55834071693485873476","price":29.99,"currency_code":"USD","in_stock":true},{"title":"5XL \/ Black","offer_id":50936575131751,"sku":"26463078747129121082","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/hafele-keating-1971_front_01_white.png?v=1793595566","url":"https:\/\/pixelatedphysics.com\/ja\/products\/jetlagga-clocks-around-the-world-1971-physics-t-shirt","provider":"Pixelated Physics","version":"1.0","type":"link"}