Human activity is rapidly increasing the negative impact of artificial skyglow at even the most remote professional observatory sites. Assessment of the actual impact requires an understanding of the propagation as a function of source spectral energy distribution. The higher blue content of light-emitting diodes being widely used as replacement for sodium discharge lamps has greater impact closer to the source, and less impact for more distant mountain-top sites. All-sky cameras with moderate angular resolution provide data and metrics sufficient to model and remove celestial contributions and provide measures of artificial light contribution. The natural skyglow is significantly affected by solar activity, which must be accounted for in determining secular trends in the artificial component. With the availability of the New World Atlas of the Artificial Sky Brightness, a direct comparison is made of the modeled artificial contribution to the sites with the largest aperture telescopes, noting the possible systematic errors in individual cases. Population growth of the nearest urban centers allows a prediction of the change in that brightness over a decade. All site protections are effected primarily by national or regional regulation. A collection of worldwide regulations shows that most are leveraged off environmental protection statutes, while in the U.S., they are largely based on land-use zones. Particular examples are presented in more detail for Flagstaff, Arizona, and the Island of Hawai’i. The latest rapidly growing threat is that of reflected sunlight from large constellations of satellites in low-earth orbit. A snapshot is provided of that rapidly changing situation. In all cases, astronomers must become very proactive in educating the public about the cultural value of visual or naked eye astronomy as well as the science and the need for access to a dark night sky for astronomical research.

即使在最偏远的专业天文台地点，人类活动也正在迅速增加人造夜光的负面影响。对实际影响的评估需要了解作为源光谱能量分布函数的传播。广泛用作钠放电灯替代品的发光二极管的蓝光含量较高，对靠近光源的地方的影响更大，而对更远的山顶地点的影响较小。具有中等角分辨率的全天相机提供足以建模和消除天体贡献的数据和指标，并提供人造光贡献的测量。自然天空辉光受到太阳活动的显着影响，在确定人造组件的长期趋势时必须考虑到这一点。随着新世界人造天空亮度图集的推出，对具有最大孔径望远镜的地点的模拟人工贡献进行了直接比较，并注意到个别情况下可能存在的系统误差。最近城市中心的人口增长可以预测十年内亮度的变化。所有遗址保护主要受国家或地区法规的影响。一系列全球法规显示，大多数法规都利用了环境保护法规，而在美国，它们主要基于土地使用区域。更详细地介绍了亚利桑那州弗拉格斯塔夫和夏威夷岛的具体示例。最新迅速增长的威胁是近地轨道大型卫星群反射的阳光。提供了快速变化的情况的快照。 在所有情况下，天文学家都必须非常积极地教育公众视觉或肉眼天文学的文化价值以及科学以及进入黑暗夜空进行天文研究的必要性。