Menu
Home
People
Places
Arts
History
Plants & Animals
Science
Life & Culture
Technology
Reference.org
Louis Essen
open-in-new
<p> Louis Essen <a href="/facts/OBE/HlY9buuN">OBE</a> <a href="/facts/Fellow_of_the_Royal_Society/cWs8TdC5">FRS</a>(6 September 1908 – 24 August 1997) was an English <a href="/facts/Physicist/cQcgvSIm">physicist</a> whose most notable achievements were in the <a href="/facts/Accuracy_and_precision/JQ47xXDq">precise</a> measurement of <a href="/facts/Time/HceJKUGB">time</a> and the determination of the <a href="/facts/Speed_of_light/sKSQwdNx">speed of light</a>. He was a critic of <a href="/facts/Albert_Einstein/CNTet8qu">Albert Einstein</a>'s <a href="/facts/Theory_of_relativity/qGHj3eTC">theory of relativity</a>, particularly as it related to <a href="/facts/Time_dilation/fYj7FYbK">time dilation</a>. </p>