heliacal 的定义
Astronomy.
- pertaining to or occurring near the sun, especially applied to such risings and settings of a star as are most nearly coincident with those of the sun while yet visible.
heliacal 近义词
等同于 solar
更多heliacal例句
- Implying hereby the Heliacal ascent and Cosmical descent of those stars.
- This period, measured thus by the heliacal rising of Sothis, is spoken of as the Sothic cycle.
- The heliacal rising of a constellation is when it comes from under the rays of the sun, and begins to appear before daylight.
- I do not see how the heliacal rising of Sirius in any one year could help them to determine its length.
- They also possessed lists of the fixed stars, and drew up tables of the times of their heliacal risings.