noun
mean solar time
Technical astronomical term for time based on the average motion of the sun, as opposed to apparent solar time.
平均太陽時は、実際の太陽の動きではなく、平均的な太陽の位置に基づいて決められる。
Mean solar time is determined based on the average position of the sun, not the actual motion of the sun.
Apparent solar time, based on the actual observed position of the sun, as opposed to the averaged mean solar time.
Compound of 平均 (mean, average) + 太陽 (sun) + 時 (time). A calque from English 'mean solar time'.