恒こう星せい年ねん

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Meanings

1

noun

sidereal year

Astronomical term: the time Earth takes to orbit the Sun relative to the fixed stars, about 365.256 days.

star, spot, dot

年year, counter for years

太たい陽よう年ねん
太陽年 (tropical year) is based on the seasons (equinox to equinox) and is about 365.242 days, slightly shorter than a sidereal year.

Compound of 恒星 (fixed star) and 年 (year), a calque from Western astronomy.