semimajor

semimajor

1. semimajor axes

半长轴

2. Length of the semimajor axis of earth's orbit around the sun: 92,955,808 mi (149,597,870 km), often defined simply as the average distance from earth to the sun.

地球绕太阳旋转的椭圆轨道半长轴的长度：92,955,808哩（149,597,870公里），通常则指地球到太阳的平均距离。

3. semimajor axis of beam cross-section

束流截面的长半轴

4. Either half of the major axis is called a semimajor axis .

长轴的每一半叫做半长轴。

5. Atens: semimajor axes less than 1.0 AU and aphelion distances greater than 0.983 AU;

阿托恩：半长轴小于1个天文单位，远日点大于0。983天文单位；