Time Series Analysis is analysis of data representing a function of time, collected at specific points in time that are separated by a uniform interval. Such analysis is used in astronomy and numerous other fields, including signal processing, communications engineering, and weather forecasting.
There are many techniques, which can be classified as:
In astronomy, data is often collected at irregular intervals, so the "time series analysis" used must accommodate that. Intervals involved can be fractions of a second or can be years, e.g., using historical data.