视宁度
视宁度（英文：Seeing 或 Astronomical seeing），是用于描述天文观测的目标受大气湍流的影响而看起来变得模糊和闪烁程度的物理量。
视宁度严格来说是属于大气科学研究的范畴，从事天文观测的科学家对此非常关注，因为它的好坏对天文光学观测的质量影响很大。世界上重要的光学天文台，如夏威夷的莫纳克亚山、加那利群岛的拉帕尔玛岛等的视宁度条件都很理想。科学家会在候选的光学观测台址上测量视宁度，例如美国正计划建一架30米口径望远镜，就在墨西哥北部和智利北部等多处进行视宁度的测量。
Astronomical seeing
中文百科
英语百科
Astronomical seeing 视宁度
Astronomical seeing refers to the blurring and twinkling of astronomical objects such as stars caused by turbulent mixing in the Earth's atmosphere varying the optical refractive index. The astronomical seeing conditions on a given night at a given location describe how much the Earth's atmosphere perturbs the images of stars as seen through a telescope.
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