Editing Time-variant system (section)

== Examples of time-variant systems ==
The following time varying systems cannot be modelled by assuming that they are time invariant:
* The Earth's thermodynamic response to incoming [[Solar irradiance]] varies with time due to changes in the Earth's [[albedo]] and the presence of [[greenhouse gas]]es in the atmosphere.<ref>{{Cite journal|last=Sung|first=Taehong|last2=Yoon|first2=Sang|last3=Kim|first3=Kyung|date=2015-07-13|title=A Mathematical Model of Hourly Solar Radiation in Varying Weather Conditions for a Dynamic Simulation of the Solar Organic Rankine Cycle|journal=Energies|language=en|volume=8|issue=7|pages=7058–7069|doi=10.3390/en8077058|issn=1996-1073|doi-access=free}}</ref><ref>{{Cite journal|last=Alzahrani|first=Ahmad|last2=Shamsi|first2=Pourya|last3=Dagli|first3=Cihan|last4=Ferdowsi|first4=Mehdi|date=2017|title=Solar Irradiance Forecasting Using Deep Neural Networks|journal=Procedia Computer Science|language=en|volume=114|pages=304–313|doi=10.1016/j.procs.2017.09.045|doi-access=free}}</ref>
*[[Discrete wavelet transform]], often used in modern signal processing, is time variant because it makes use of the [[decimation (signal processing)|decimation]] operation{{dubious|date=July 2021}}.