子午線|しごせんshigosen[2]nakadaka (mid-high)

1. noun, geographymeridian
   日本にっぽんの子午線しごせんは東経とうけい１３５度どです。↗

   Japan is on the 135th meridian East.
2. noun, astronomymeridian

• Synonym経線けいせんWrittenLiterary synonym of 子午線; it denotes the same north-south lines running from pole to pole and is at home in formal written geographical prose.

Choose 子午線 as the default term for a meridian; reserve 経線 for contexts calling for a literary register, such as formal written geographical description.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 北極点ほっきょくてんと南極点なんきょくてんを地球ちきゅうの表面ひょうめん上じょうでまっすぐ結むすぶ線せん。