tropical point的意思|示意

The Aries point, or vernal equinox in the tropical zodiac, is a NODE. It marks the place where the sun crosses the equatorial plain going north.

白羊点是一个交点，也为春分点，太阳由南向北时通过天球赤道的点，。

When heat content increased, the ridge point of subtropical high moved more westly, and frequency of tropical cyclone moving from Pacific into South China Sea increased, otherwise it decreased;

热带西北太平洋西部热含量增加时，副热带高压脊点偏西，移入南海的热带气旋频数增加，反之减少。