Ji̍t-thaû nî

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1 ê Ji̍t-thaû nî (tropical year) tō sī lán ùi Tē-kiû khoàⁿ Ji̍t-thaû se̍h n̂g-tō 1 lìn khai ê sî-kan. Cheng-khak ê sî-kan tio̍h khoàⁿ ùi toh 1 tiám khai-sí sǹg, lán phó͘-thong lóng sī ùi chhun-hun (vernal equinox) khí-sǹg, án-ne ê 1 ê Ji̍t-thaû nî tō sī chhun-hun nî (vernal equinox year); nā ēng só͘-ū ê tiám khí-sǹg chiah koh chhé-ûn, án-ne ê 1 ê Ji̍t-thaû nî tō sī pêng-kin Ji̍t-thaû nî (mean tropical year).