From Longman Dictionary of Contemporary Englishsolar yearˌsolar ˈyear noun [countable] TMCthe period of time in which the Earth travels once around the Sun, equal to just over 365 days
Examples from the Corpus
solar year• But since then our calendar year has been the same as the solar year.• Our calendar year is based on the solar year - the number of days the earth takes to travel round the sun. 