The phrase "year time scale" refers to a measurement or period of time that spans a whole year. It is a way to measure or describe events, changes, or processes that happen over the course of a year. Full definition
This flight adds to our understanding of how the atmosphere of Pluto evolves over multiple - year time scales as its elongated orbit takes it farther away from the sun.» (space.com)
Compared with the seven - year time scale of the Nestle boycott, or the multiyear boycotts of corporations operating in South Africa during the 1980s, this was something new. (businessinsider.com)
We show here that the X-ray and optical emissions of the prototype of the class, Gamma - Cas, are very well correlated on year time scales with no significant time delay. (arxiv.org)