Last Updated：2025/11/20

The reference line at 0° longitude, passing through Greenwich, England, from which longitude east and west is measured.

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prime meridian

Source Word

prime meridian

Noun

The reference line at 0° longitude, passing through Greenwich, England, from which longitude east and west is measured.

Japanese Meaning

本初子午線：0°の経度の基準線で、イギリスのグリニッジを通るその線により、東西の経度が測定される

The ship's navigation system recalibrated its coordinates when it crossed the prime meridian near Greenwich.

船の航法システムは、グリニッジ付近で本初子午線を越えたときに座標を再調整した。

Sense（1）

The reference line at 0° longitude, passing through Greenwich, England, from which longitude east and west is measured.

Coordinate term: antimeridian

prime meridians

（ plural ）