noun
solar year; tropical year
Astronomical term for the time it takes the Earth to complete one orbit around the Sun, measured from one vernal equinox to the next.
太陽年は約365.2422日です。
A solar year is approximately 365.2422 days.
恒星年 (sidereal year) is measured relative to the fixed stars, while 太陽年 is measured relative to the vernal equinox.
Compound of 太陽 (taiyō, 'sun') and 年 (nen, 'year').