| Time |
|---|
 |
The present is the period of time that is occurring now. The present is contrasted with the past, the period of time that has already occurred, and the future, the period of time that has yet to occur.
It is sometimes represented as a hyperplane in space-time,[1] typically called "now", although modern physics demonstrates that such a hyperplane cannot be defined uniquely for observers in relative motion. The present may also be viewed as a duration.[2][3]
- ^ Sattig, Thomas (2006-05-11). The Language and Reality of Time. Clarendon Press. p. 37. ISBN 978-0-19-927952-4.
- ^ James, William (1890). The Principles of Psychology. H. Holt. p. 609.
- ^ Hodder, Alfred (1901). The Adversaries of the Sceptic: Or, The Specious Present, a New Inquiry Into Human Knowledge. S. Sonnenschein & Company, Limited. pp. 36–56.