Craig Callender > Quotes

“if the Now moves, it must move with respect to time. But the Now is time. So is it moving with respect to itself? No, says Williams, that doesn’t make sense. If it’s moving, it must be moving with respect to a second time – the second one being the time with respect to which the first one moves. Tensers”
― Craig Callender, Introducing Time: A Graphic Guide

“Aristotle (384–322 BC), the Greek philosopher, held that time is simply the measure of motion. Time is the measure of one physical process against another.”
― Craig Callender, Introducing Time: A Graphic Guide

“second is defined precisely to be 9,192,631,770 vibrations of the cesium atom!”
― Craig Callender, Introducing Time: A Graphic Guide

“the past, present and future all exist but not at the same times. In”
― Craig Callender, Introducing Time: A Graphic Guide

“what’s done is done”, that the past cannot be changed, and that the future can be changed because it is “open”. To”
― Craig Callender, Introducing Time: A Graphic Guide

“By 1800 BC, the ancient Babylonians had divided the day into hours, the hour into sixty minutes, and the minute into sixty seconds.”
― Craig Callender, Introducing Time: A Graphic Guide

“HYPOTHALAMUS These cells are linked to the retina of our eyes and appear to regulate cycles of hormone secretion, our skin temperature and cycles of rest and wakefulness. The hormone melatonin is thought to play a significant role in controlling our daily (circadian) rhythm.”
― Craig Callender, Introducing Time: A Graphic Guide